The short answers. Where a question needs more room than a paragraph, there's a longer article on it. Most of this is about making a better cup with what you already have.
Tea Questions.
How much caffeine is in tea compared to coffee?
Usually less, but the difference depends on what you're brewing. For a useful reference, an ordinary 8-ounce cup of brewed black tea averages about 48 milligrams of caffeine, green tea about 29 milligrams, and brewed coffee about 96 milligrams. Those are averages, not guarantees. The tea plant, amount of leaf, water temperature and steeping time can all change the result. Matcha can be relatively high in caffeine because you're drinking the powdered leaf itself. If caffeine is the deciding factor, don't trust the color of the tea to give you a number.
Does green tea have less caffeine than black tea?
In an ordinary brewed cup, often yes. But the reason isn't simply that one tea is green and the other black. Oxidation doesn't create caffeine, and both kinds of tea contain it before processing. Black tea is commonly brewed hotter and longer, which affects how much caffeine reaches the cup. The variety and age of the leaves matter too. Some shade-grown Japanese greens and bud-heavy white teas can contain substantial caffeine. Our guide to green, black, oolong and white tea explains why the usual ranking is less dependable than it looks.
Why does my tea taste bitter?
Start with the water temperature and the timer. Water that's too hot for the leaf, a steep that ran too long, or too much tea for the amount of water can push bitterness and astringency out of balance. Green tea is particularly sensitive to high brewing temperatures, so try 160–180°F as a starting point. And contrary to a popular story, gently squeezing a tea bag doesn't release a mysterious reserve of tannins. The brewing conditions matter much more. Our guide to fixing bitter tea walks through the causes in the order worth checking.
How long should I steep tea?
For ordinary mug brewing, start with green tea at one to three minutes, and white, oolong and black tea at three to five. Herbal infusions often need five minutes or longer, depending on the ingredients. These are starting points rather than laws. Delicate Japanese greens may need less time, while some whole-leaf teas tolerate much longer steeps. Use a timer and follow the producer's instructions when they're available. Color isn't a dependable guide: black tea can darken quickly, and green tea can remain pale even when it's become unpleasantly strong.
Should water be boiling for tea?
For many robust black teas and ripe pu-erh, water near boiling works well. Most delicate green teas prefer cooler water, and oolong and white tea cover a much wider range than people expect. A roasted oolong or certain white teas may handle almost boiling water beautifully. Without a temperature-controlled kettle, you can mix roughly three parts boiling water with one part room-temperature water to get close to 175°F, assuming the room-temperature water is around 70°F. It's an approximation, but a useful one. If the kettle only has an on switch, you still have options.
Is loose leaf better than tea bags?
Not automatically. Many standard tea bags contain small pieces of leaf that brew quickly and consistently. Whole leaves often extract more gradually and can reward multiple infusions, but a good tea in a roomy sachet can be excellent too. What matters is the quality of the leaf, how it's processed and whether you're brewing it appropriately. Fine particles may turn strong or harsh sooner, so shorten the steep if necessary. Loose leaf gives you more control and often more opportunities to re-steep. It doesn't make every tea bag bad by definition.
Can you reuse tea leaves?
Yes. Many whole-leaf teas can produce two or more worthwhile infusions, and oolongs and pu-erh are particularly good candidates. The second steep may taste different from the first as the leaves open and the flavor changes. Increase the brewing time as needed, rather than assuming every round must be identical. Re-steep during the same session using clean equipment. Don't leave wet leaves sitting at room temperature overnight and expect them to be fine tomorrow. Tea bags can be re-steeped too, although finely cut leaves often give a much weaker second cup.
Is it bad to microwave water for tea?
No. Microwave heating doesn't inherently ruin the water or the tea. The practical problems are temperature control and the small risk of superheating. In a very clean, smooth cup, water can become hotter than its normal boiling point without visibly bubbling, then erupt when disturbed. Use a microwave-safe container, follow the manufacturer's heating guidance, avoid overheating, and stir carefully during heating to help distribute the heat. A thermometer is useful if you're brewing temperature-sensitive tea. A kettle is more convenient, but the microwave isn't secretly making your green tea worse.
Does tea go bad?
Dry tea mostly loses freshness rather than suddenly expiring, provided it's stored properly. Green tea often loses its bright aroma relatively quickly, while many black teas hold up longer. Some pu-erh and other teas are intentionally aged under suitable conditions. Keep ordinary tea airtight, cool, dry and away from light and strong odors. If it becomes damp, develops visible mold or smells musty, throw it out.
Brewed tea is different. Make it with clean equipment, refrigerate it promptly if you're saving it, and aim to finish homemade iced tea within a few days for best quality. Don't use an eight-hour countertop rule as permission to leave a jug sitting out all afternoon. Tea containing milk, cream or other perishable additions needs particular care and should follow the usual two-hour refrigeration rule, or one hour above 90°F.
Is herbal tea actually tea?
Not in the strict botanical sense. True tea comes from Camellia sinensis. Chamomile, peppermint, hibiscus and rooibos are infusions of other plants, more precisely called tisanes. Many are naturally caffeine-free, which makes them useful in the evening. But herbal doesn't automatically mean caffeine-free: yerba mate, guayusa and yaupon all contain caffeine. Brewing temperatures and times vary by ingredient, so don't assume every herbal blend wants exactly the same treatment.
What's the difference between matcha and regular green tea?
With ordinary green tea, you steep the leaves and remove them. With matcha, you whisk finely powdered tea into water and drink the suspended leaf itself. Traditional matcha is made from shaded tea leaves processed into tencha before grinding, which helps give it its deep green color and savory character. Since the whole powdered leaf goes into the drink, matcha can provide substantial caffeine, although the amount depends on the serving. Our tea glossary explains matcha, tencha and the other Japanese tea terms worth knowing.
Why does my iced tea turn cloudy?
It's often a harmless effect called tea creaming. As brewed tea cools, compounds including polyphenols and caffeine can associate into tiny particles that scatter light. Stronger tea and certain mineral conditions make the cloudiness more noticeable. It doesn't automatically mean the tea is spoiled. Brewing less concentrated tea or experimenting with different water may help, and gentle reheating can temporarily clear some cloudiness. Cold brewing can reduce the problem, but doesn't guarantee a perfectly clear drink. If the tea also smells unpleasant, has visible mold or has been stored improperly, don't blame the cloudiness and drink it anyway.
Does milk change what's in the tea?
Yes. Milk proteins can interact with tea polyphenols, and the fat, proteins and natural sweetness of milk change how the drink tastes and feels. That's why strong black tea often becomes softer and rounder with milk. Researchers have also studied whether those interactions affect how tea compounds behave after drinking them, but the results aren't simple enough to turn into a rule about health benefits. Drink it with milk if you enjoy it. Drink it without milk if you don't. The cup isn't taking attendance.
Coffee Questions.
How long does coffee stay fresh after opening?
Whole beans generally hold their flavor longer than ground coffee, because grinding exposes much more surface area to air. Freshly roasted whole beans often taste best over a period of weeks, while pre-ground coffee can lose noticeable aroma much sooner after opening. There isn't a single expiration date for flavor. Roast level, packaging and storage conditions all matter. Keep coffee sealed, cool, dry and away from light, and buy an amount you'll actually finish. Dry coffee doesn't instantly become unsafe when its flavor fades, but anything damp, moldy or musty belongs in the trash.
Should I keep coffee in the fridge or freezer?
For coffee you'll use soon, neither. A sealed container in a cool, dark cupboard is simpler and avoids unnecessary exposure to moisture and kitchen odors. The freezer can help with longer storage if you divide the coffee into airtight portions before freezing and remove only what you need. Repeatedly opening a cold bag in a warm, humid kitchen encourages condensation. The refrigerator offers few advantages for everyday coffee and plenty of opportunities for it to absorb smells. Coffee should taste like coffee, not whatever you made for dinner.
Does dark roast have more caffeine?
Not reliably. Dark roast tastes stronger because roasting changes its flavor, not because the beans automatically gain caffeine. A 2024 study in Scientific Reports found that darker roasts generally produced lower caffeine concentrations under identical brewing conditions, but the relationship changed when researchers compared brews at the same extraction yield. Roast level, bean type, dose and brewing method all affect the result. Darker beans are also generally less dense, so a scoop can contain less coffee by weight. If you want to compare caffeine fairly, weigh the grounds. The color alone won't settle it.
Why is my coffee bitter?
It may be the roast, the brewing method, or both. Dark roasts can carry pronounced roasted bitterness before the kettle gets involved. Brewing too aggressively can also create an unbalanced cup: a grind that's too fine, excessive contact time or an unsuitable temperature may bring out harsh flavors. Weakness and bitterness aren't the same problem, so adding more grounds isn't a universal cure. If the coffee is thin, check the coffee-to-water ratio. If it's harsh, adjust the extraction or try a lighter roast. A few grains of salt can soften perceived bitterness, but won't repair a badly brewed cup. Our guide to making inexpensive coffee taste better
Why is my coffee sour?
Sometimes the brewing hasn't extracted enough of the flavors that balance the coffee's natural acidity. A grind that's too coarse, a brew that's too short or water that's too cool can leave the cup sharp and thin. But sourness isn't always a mistake. Many light roasts have deliberately bright, fruity acidity, and a coffee can taste both sour and bitter.
If you're brewing freshly ground coffee, try grinding slightly finer or increasing contact time, then taste again. If you're using pre-ground, you can experiment with temperature, dose and brewing time instead. Change one thing at a time. Sour and bitter are useful clues, not a complete laboratory report.
How much coffee should I use per cup?
For ordinary filter coffee, start around 1 gram of coffee to 16–18 grams of water. That means roughly 15 grams of coffee for an 8-ounce mug, depending on how strong you like it. Without a scale, about two tablespoons of grounds per 6 ounces of water is a familiar starting point, but tablespoons vary with grind and roast. Also remember that the cup markings on some drip machines represent roughly 5 or 6 ounces, not a full drinking mug. If the coffee tastes weak, check the amount you're using before deciding the beans are the problem.
What temperature should water be for coffee?
About 195–205°F is a dependable starting range for most filter coffee. Different roasts and brewing methods may benefit from different temperatures. Light roasts sometimes respond well to hotter water, while a dark roast may taste better brewed a little cooler. Boiling water doesn't burn coffee grounds, and it doesn't automatically make every brew bitter. Temperature changes extraction, which is why it matters. Without a thermometer, bring the kettle to a boil and let it cool briefly before pouring, remembering that the time needed depends on the kettle and room.
Is instant coffee real coffee?
Yes. It's coffee that has already been brewed, then dried by methods such as freeze-drying or spray-drying. Add water and you're reconstituting it, not making something unrelated to coffee. Instant often contains less caffeine per typical serving than regular brewed coffee, although brands and serving sizes vary. If the granules clump, try mixing them with a small amount of water first to make a smooth paste, then add the rest. Some people prefer the result, but it isn't a proven fix for every instant coffee. The jar has limits. That doesn't mean it can't make a good Tuesday morning cup.
Is it bad to reheat coffee?
For plain black coffee that's been handled and stored properly, reheating is generally more of a flavor problem than a safety problem. Aromatic compounds change or disappear, and prolonged heat can make the cup taste flat or harsh. A thermal carafe usually preserves freshly brewed coffee better than leaving it on a hotplate. If you've added milk or creamer, follow normal food safety rules: refrigerate promptly and don't try to rescue a drink that's been left at room temperature beyond safe limits. Reheating doesn't erase poor storage.
Why does my coffee taste burnt?
Start with the beans. Dark roasting creates smoky, charred and bitter flavors that some people enjoy and others don't. If the coffee tastes fine when first brewed but unpleasant after sitting, a hotplate may be responsible. Old coffee residue and oils in a machine can also contribute stale or unpleasant flavors. Clean the brewer according to its instructions, including descaling when needed. If the first fresh cup still tastes burnt, the roast itself may be the answer. Try a medium roast before accusing the kettle.
Does salt in coffee actually work?
It can. Small amounts of salt can suppress perceived bitterness, which is why a few grains may soften a harsh or heavily roasted cup. Salt doesn't meaningfully neutralize coffee's acidity, and it won't restore aroma to stale grounds. Start with only a few grains in a mug and taste before adding more. A very small amount can help. Enough salt to notice it as salt has usually gone too far. The goal is better coffee, not coffee that tastes like soup.
What is blooming, and does it matter?
Blooming is the short pause after you first wet freshly ground coffee, especially in pour-over brewing. Pour roughly twice the coffee's weight in hot water, make sure the grounds are wet, and wait about 30–45 seconds before continuing. Roasted coffee contains trapped carbon dioxide, which escapes when water reaches the grounds. Giving it time to release can help the coffee wet more evenly.
The bloom is often more noticeable with recently roasted coffee. Older pre-ground coffee may barely bubble at all, but bloom size also depends on roast level, grind, temperature and storage. A quiet bloom isn't proof that the coffee is stale, and a dramatic one isn't proof it'll taste good. It's a useful step, not a personality test for the beans.
What's the difference between cold brew and iced coffee?
Iced coffee is brewed hot, then chilled or poured over ice. Cold brew is extracted using cool or cold water over a longer period, commonly around 12–18 hours, although recipes vary. Cold brew often tastes smoother and less sharply bitter or sour than comparable hot-brewed coffee, but the difference depends on the beans and recipe. It may be brewed ready to drink or as a concentrate.
Neither method has a guaranteed caffeine advantage. The amount in your glass depends on the coffee dose, extraction and how much you dilute the finished drink. Make cold brew with clean equipment, keep it refrigerated during preparation, and refrigerate the finished coffee.
Does decaf have caffeine?
Usually a little. Decaffeination removes most of the caffeine, not necessarily every last milligram. Mayo Clinic's reference values put an ordinary 8-ounce cup of brewed decaf coffee at approximately 1 milligram, compared with about 96 milligrams for regular brewed coffee. Actual amounts vary, and large commercial servings can contain more. Decaf is a good choice for reducing caffeine, but if you must avoid it completely, don't assume the word means zero.
Can you make good coffee with pre-ground?
Absolutely. Fresh grinding offers advantages, but it isn't the only thing standing between you and a better cup. Use enough coffee for the water, try filtered water if your tap tastes unpleasant, and pay attention to brewing time and temperature. If you drink coffee with milk, warming and frothing it properly can make a noticeable difference. For iced coffee, dissolve sugar while the coffee is hot or use simple syrup.
Keep the bag sealed, away from heat, light and moisture, and buy a quantity you'll finish while it still tastes good. Our seven fixes for pre-ground, instant and K-Cup coffee cover the rest. You don't need a new grinder to improve what's already on the counter.
Nothing here is especially complicated. Most disappointing cups come down to a handful of variables: the amount of tea or coffee, the water, the temperature, the time, and what happened before the brewing started.
Learn what each one changes and the next bad cup becomes easier to fix. Kinako would call that practice. He'd probably also put the kettle on.
Question we haven't answered? Send it over through our contact page. Good questions are always welcome at the teahouse.