Kitchen Math, Memorized For You?

Every conversion and timing question you look up mid-recipe with wet hands. 43 questions and counting.

Why do onions make you cry?Cutting an onion releases an enzyme that builds a sulfur gas; it reaches your eyes, reacts with tears to form mild sulfuric…
Do eggs actually need to be refrigerated?In the US, yes: American eggs are washed, which strips the natural protective coating, so they must stay cold. In much of…
How do you cook bacon in the oven?Lay strips on a foil-lined sheet, into a cold oven, then heat to 400F for 15 to 20 minutes. No flipping, no splatter, even…
How do you keep guacamole from turning brown?Block the air. Browning is oxidation, so press plastic wrap directly onto the surface, or float a thin layer of water on top…
How do you ripen an avocado quickly?Put it in a paper bag with a banana or apple. Those fruits release ethylene gas, which speeds ripening, and the bag traps…
How do you tell when a steak is done?Use a thermometer and pull it about 5 degrees below your target, since it keeps cooking while resting. Medium rare is 130 to…
How long can you keep meat in the freezer?Indefinitely for safety, but quality fades. Frozen at 0F, meat stays safe forever; taste and texture decline over months…
How long can food safely sit out?Two hours, one if it is above 90F. Between 40 and 140F is the danger zone where bacteria double every 20 minutes. When in…
How long do leftovers actually last in the fridge?Three to four days for most cooked leftovers, refrigerated. Freezing extends it for months. The clock matters more than the…
How long does cooked chicken last in the fridge?Three to four days in the fridge, per the USDA, and the clock does not reset when you reheat it. Freeze anything you will…
Is milk still good after the expiration date?Usually yes. The date is about quality, not safety, and refrigerated milk often stays good five to seven days past it. Smell…
How long do you boil eggs?Lower eggs into already-boiling water: 7 minutes for jammy, 11 for fully hard. Then straight into ice water, which stops the…
How many ounces are in a cup?8 fluid ounces in a cup. But fluid ounces measure volume and regular ounces measure weight, so a cup of flour weighs about…
What is the water to rice ratio?Two to one for white rice: two cups water per cup of rice. Brown rice needs more, about 2.25 to 2.5 to one, and longer…
Can you cut the mold off food and eat the rest?Depends on the food. On hard cheese or firm produce, cut an inch around it and eat the rest. On soft foods, bread, soft…
Should you wash raw chicken before cooking it?No. Rinsing chicken sprays bacteria up to three feet around your sink and kills nothing. Cooking to 165°F does all the…
What is the difference between baking soda and baking powder?Baking soda is pure base and needs an acid to work; baking powder is baking soda plus its own built-in acid, so it works…
What temperature is chicken done?165°F in the thickest part, per the USDA. Color is not a doneness test; only a thermometer is. Dark meat tastes better…
Why do you salt pasta water, and does it make it boil faster?You salt it to season the pasta from the inside, which is the only chance you get. It does not make water boil faster, it…
Should you rinse rice before cooking it?Yes for most long-grain and basmati rice, where rinsing removes surface starch and gives separate fluffy grains. No for…
What temperature should your refrigerator and freezer be?Refrigerator at or below 40 degrees Fahrenheit, freezer at 0. Most built-in displays are unreliable, so use a standalone…
Why does popcorn pop?Moisture sealed inside the hard hull turns to steam under heat until the pressure bursts the kernel, and the starch inside…
Why do apples turn brown, and how do you stop it?An enzyme meets oxygen when you cut the fruit and produces brown pigments. Acid slows the enzyme down, which is why lemon…
How can you tell if eggs have gone bad?The float test works: fresh eggs sink and lie flat, older ones tilt up, and ones that float should be discarded. The…
What temperature should meat be cooked to?Poultry to 165, ground meat to 160, whole cuts of beef, pork, and lamb to 145 with a three-minute rest. Color is not a…
Can you freeze cheese?Hard and semi-hard cheeses freeze fine for cooking, though they turn crumblier. Soft cheeses like brie and fresh mozzarella…
How often should you sharpen a kitchen knife?Hone it every few uses and sharpen it a couple of times a year for home cooking. Honing realigns the edge; sharpening…
How do you cook rice without ruining it?For long-grain white rice: rinse it, use 1.5 cups water per cup of rice, simmer covered 18 minutes, then rest 10 off the…
Is it actually dangerous to eat raw cookie dough?The bigger risk is the flour, not the egg. Raw flour carries E. coli and causes real outbreaks. Heat-treated flour plus…
What does the color of an egg yolk mean?Yolk color reflects the hen's diet, not the egg's nutrition or freshness. A deep orange yolk means a diet rich in marigold…
What is the difference between baking and roasting?Mostly temperature and what you are cooking. Roasting uses higher heat on foods with existing structure, like meat and…
What is the difference between broth and stock?Stock is made from bones and simmers longer, giving body and gelatin; broth is made from meat and is thinner but more…
Why do recipes insist on room temperature butter and eggs?Because temperature changes the chemistry. Room temperature butter traps air when creamed, which is what leavens a cake, and…
Why does bread go stale, and why does the fridge make it worse?Staling is starch recrystallizing, not drying out, which is why refrigeration accelerates it. The fridge sits at the…
Why does my nonstick pan stick?Usually heat and wear. High heat degrades nonstick coating and warps the pan, metal utensils scratch it, and worn coating…
How do you season and care for cast iron?Thin layers of oil polymerized by heat, repeated. The rule against soap is outdated, since modern dish soap does not strip…
How do you cut an onion without crying?Chill the onion, use a genuinely sharp knife, and cut near a running fan or vent. Cold slows the reaction that releases the…
What is the difference between jam, jelly, preserves, and marmalade?Jelly uses strained juice only and sets clear. Jam uses crushed fruit and is thicker. Preserves contain whole or large…
How do you adjust a recipe for a different pan size?Scale by area for the same depth: compare the pan areas and multiply the recipe by the ratio. A 9-inch round is about 64…
Do you need to rinse dishes before putting them in the dishwasher?No, and you should not. Scrape off solids, then load them dirty. Modern detergents contain enzymes that need food residue to…
How do you get rid of a smell in the fridge?Find and remove the source, then clean every surface including the drip pan and door gaskets. Baking soda helps only after…
What is the best way to store and reheat leftovers?Cool fast in shallow containers and refrigerate within two hours; deep containers keep the center in the danger zone for…
How many cups are in a gallon?16 cups in a gallon. The full ladder: 2 cups to a pint, 2 pints to a quart, 4 quarts to a gallon. Everything doubles, which…