Ten things most home cooks believe that turn out not to be true — and what actually happens instead
By the chef at NowCook · August 2, 2026 · 7 min read
Kitchen advice travels in strange ways. A tip that made sense in one context gets stripped of its nuance, repeated widely, and eventually treated as settled fact. Some of these myths are harmless. Others actively lead home cooks to produce worse food — overcooked meat, underseasoned water, sticky pasta — because they're working from an incorrect model of what's happening inside the pot.
What follows is a look at ten of the most persistent kitchen myths, what most people believe, and what's actually going on.
The Myths, One by One
Myth #1
Searing meat "seals in" the juices
This is probably the most durable cooking myth in existence. The idea: searing creates a crust that acts like a barrier, keeping moisture locked inside the meat as it cooks.
What's actually true: Searing does not seal anything. You can measure the moisture loss from seared vs. unseared meat and find no meaningful difference. What searing does do is create flavor — specifically through the Maillard reaction, the chemical process that produces hundreds of flavor and aroma compounds when proteins and sugars hit high heat. The crust is valuable. The "sealing" explanation is just wrong. Sear meat because it tastes better, not because it traps moisture.
Myth #2
Adding oil to pasta water prevents sticking
Drop a glug of olive oil in the pasta water and the noodles won't clump together — or so the theory goes.
What's actually true: Oil floats on water. It doesn't coat the pasta during cooking; it sits on the surface and goes down the drain when you drain the pasta. What it does do is coat the pasta slightly as you drain it — which then prevents sauce from sticking to the noodles. If you want pasta that holds sauce well, skip the oil. To prevent clumping after draining, toss the pasta immediately with your sauce while it's still hot, or with a small drizzle of olive oil if you're not saucing it immediately.
Myth #3
You should never wash mushrooms — they absorb water
Food writers have repeated this for decades. Wipe mushrooms with a damp cloth, they say. Never rinse them or they'll turn waterlogged and soggy.
What's actually true: Mushrooms do absorb water, but the amount they absorb in a quick rinse is minimal — roughly 2–3% of their weight. More important is how you cook them after. The real enemy of mushroom texture is crowding the pan. When mushrooms are piled on top of each other, they steam instead of sear. Give them room in a hot dry pan and they'll brown regardless of whether they were rinsed. Rinse them if they're dirty; dry them briefly with a towel; give them space in the pan.
Myth #4
Alcohol completely cooks off when you cook with wine
The assumption: once you add wine to a braise or sauce and let it simmer, the alcohol evaporates completely.
What's actually true: Cooking does reduce alcohol content significantly, but not to zero — not even close. A dish simmered for 15 minutes retains roughly 40% of its original alcohol. After an hour, about 25% remains. After two and a half hours, it's still around 5%. The flavor transformation (the sharp bite of wine converting to softer, more complex notes) does happen, but residual alcohol remains. Worth knowing if you're serving food to children or to people who avoid alcohol for any reason.
Myth #5
Fresh herbs are always better than dried
Fresh is better, full stop. This principle gets applied universally by home cooks who then spend money on bunches of fresh herbs for applications where dried would produce superior results.
What's actually true: Fresh herbs are better in applications where you want brightness and the volatile aromatics to hit the nose — stirred into a salad dressing, scattered over a finished dish, added at the last moment to a soup. Dried herbs are often better in long-cooked applications: braises, stews, tomato sauces that simmer for an hour. Dried herbs have already had their moisture removed, so they rehydrate and meld into the dish differently. Fresh thyme in a braise that cooks for three hours tastes roughly the same as dried thyme — sometimes worse, because the stems are still in there.
Myth #6
A glass of cold water stops the cooking when you pull food from the heat
Specifically: dunking vegetables in ice water stops the cooking immediately after blanching. While the ice bath part is accurate, a related myth holds that rinsing pasta with cold water "stops the cooking."
What's actually true: Ice baths for vegetables are real and effective — the temperature drop is sharp enough to halt enzyme activity and preserve color and texture. Rinsing pasta with cold water, however, removes the surface starch that helps sauce adhere, and cools the pasta so it clumps and doesn't absorb sauce properly. If pasta is overcooked, cold water won't fix it. Cook to the right doneness, drain, sauce immediately.
Myth #7
You need to add acid to keep guacamole from browning
Lime juice prevents browning — true. But the myth is that lime juice is the only or primary solution, which leads to guacamole that's so acidic it loses its avocado flavor.
What's actually true: Oxidation (browning) happens when avocado flesh is exposed to air. The most effective method to prevent it is removing the air. Press plastic wrap directly onto the surface of the guacamole with no air pockets, or store with the avocado pit pressed into the surface. Lime juice helps but works better as a seasoning element than as an anti-browning shield. If your guacamole tastes overwhelmingly acidic, you're using lime as an oxidation barrier when you should be using it as a flavor component.
Myth #8
High heat always produces better food
More heat = faster browning = better flavor. Home cooks turn burners to maximum and then wonder why everything burns on the outside and stays raw inside, or why garlic tastes bitter.
What's actually true: Different foods and techniques have different ideal temperature ranges. High heat is right for searing a steak, stir-frying, or getting a good char on vegetables. It's wrong for scrambled eggs, garlic, onions (if you want them sweet), fish fillets, and most delicate proteins. Cooking garlic on high heat for 30 seconds converts it from sweet and aromatic to acrid. Learning to taste as you cook helps you recognize when heat is helping versus hurting a dish in progress.
Myth #9
You should salt pasta water "until it tastes like the sea"
This instruction appears in countless recipes and articles. The implication: pasta water should be intensely salty — as salty as seawater.
What's actually true: Seawater is about 3.5% salinity, which is extremely salty. Well-salted pasta water is closer to 1–1.5% — noticeably salty when you taste it, but not overwhelming. The instruction is a mnemonic meant to correct the behavior of people who add no salt at all, not a literal benchmark. Add a generous pinch or two to a large pot of water; it should taste noticeably seasoned. The point is that pasta absorbs salt during cooking and cannot be seasoned after the fact.
Myth #10
Defrosting meat on the counter is fine if you do it quickly
Many home cooks leave meat on the counter for an hour or two to thaw faster, reasoning that "quick" thawing is safe.
What's actually true: Bacteria multiply rapidly between 40°F and 140°F (the "danger zone"). Meat thawing on a counter sits in this zone for as long as it's not fully frozen — which is most of the thawing time. The outside reaches room temperature while the inside is still cold, meaning the exterior can be in the danger zone for hours even in a "quick" thaw. Safe options: thaw in the refrigerator overnight, under cold running water, or cook directly from frozen using adjusted time and temperature. For the frozen-direct method, see cooking chicken from frozen.
Why These Myths Persist
Most of these myths persist because they contain a grain of truth, or because the wrong explanation happens to produce the right behavior. "Sear to seal in juices" produces well-seared meat even though the mechanism is wrong. "Never wash mushrooms" produces better mushrooms if the real takeaway (don't crowd the pan) is applied alongside it.
"Cooking advice travels faster than the context that makes it meaningful. A tip that makes sense in one specific situation gets generalized into a universal rule — and then the rule outlives the reasoning that generated it."
The practical upshot: focus on understanding what's actually happening in the pan, not just memorizing rules. Understanding the Maillard reaction explains why high heat produces flavor compounds. Understanding how sauce adheres to pasta explains why rinsing with cold water is counterproductive. The mechanism matters because it tells you what to do in novel situations where the memorized rule doesn't apply.
The Most Useful Kitchen Habit
Taste constantly. Taste before seasoning, after seasoning, mid-cook, and before serving. More food is rescued from blandness by tasting and adjusting in the moment than by any other technique. See how to taste food while cooking for a systematic approach.
For a broader look at the fundamentals that actually make food better — heat control, seasoning, timing — see cooking essentials. These are the skills that matter more than any single recipe.
If you want help turning whatever's in your kitchen into dinner without second-guessing the technique, NowCook generates meal ideas from your actual ingredients. Start free for 14 days — no credit card required. After the trial, it's $9/month or $72/year ($6/mo effective, saving $36/yr), with a 14-day refund if it's not working for you.
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