Pure ethanol boils at approximately 78°C (173°F), which is well below water’s boiling point of 100°C (212°F). But that single number is misleading. When alcohol is mixed into a sauce, soup, or stew, it doesn’t simply vanish once the dish hits 173°F. Alcohol and water form a mixture that behaves differently than either liquid alone, and a significant amount of alcohol can survive hours of cooking.
Why the Boiling Point Doesn’t Tell the Whole Story
Ethanol’s 173°F boiling point applies to pure ethanol sitting by itself in a flask. The moment you pour wine into a braise or bourbon into a glaze, the ethanol molecules are surrounded by water, sugars, fats, and other compounds. In this environment, ethanol doesn’t all flash off at a single temperature. Instead, it gradually evaporates from the surface of the liquid as the dish heats up, and it continues evaporating slowly throughout cooking. Even at temperatures below 173°F, ethanol molecules at the surface can escape into the air, the same way a puddle of water evaporates on a warm day without ever reaching a boil.
This is the core misunderstanding: many cooks assume that once a dish simmers for a few minutes, all the alcohol is gone. The reality, backed by USDA data, is that it takes a surprisingly long time to cook most of the alcohol out of food.
How Much Alcohol Actually Remains
The USDA maintains a nutrient retention table that tracks how much ethanol survives different cooking methods and durations. The numbers are higher than most people expect:
- Stirred into a hot dish and served (no further cooking): roughly 70–75% of the alcohol remains
- Baked or simmered for 15 minutes: about 40% remains
- Baked or simmered for 30 minutes: about 35% remains
- Baked or simmered for 1 hour: about 25% remains
- Baked or simmered for 2.5 hours: about 5% remains
So a quick wine-based pan sauce that simmers for 10 to 15 minutes retains close to half its original alcohol. A long-cooked beef bourguignon made with a full bottle of red wine, simmered for several hours, gets down to very low levels. One estimate for an 8-hour braise puts the final concentration around 0.2% ABV, which is roughly comparable to fruit juice or ripe bananas.
Flambéing Burns Off Less Than You’d Think
Lighting alcohol on fire looks dramatic, but the flames mostly burn ethanol vapor hovering above the surface rather than the liquid itself. Research published in the International Journal of Gastronomy and Food Science tested this directly. In a simple vodka system, flambéing removed only about 25% of the ethanol. Interestingly, heating the vodka without igniting it actually removed more, around 35%, because the liquid spent more time at high temperature instead of being briefly engulfed in a quick flame.
In a more realistic test using a caramel sauce made with butter, sugar, and vodka, the difference was even smaller. The flambéed sauce lost about 13% of its alcohol, and the heated-but-not-ignited sauce lost about 14%. The flame made virtually no difference. Most of the alcohol loss came from heat exposure, not combustion.
What Actually Speeds Up Evaporation
If temperature alone doesn’t determine how fast alcohol leaves your dish, what does? Researchers modeling ethanol loss during cooking found a somewhat surprising answer: pot size and cooking temperature had little measurable effect on the final ethanol concentration. What mattered was how much liquid had evaporated overall and the initial alcohol concentration. As the total volume of liquid in the pot decreases through evaporation, the ethanol concentration drops following a predictable pattern.
One factor that did make a clear difference was covering the pot with a lid. Counterintuitively, using a lid caused ethanol concentration to decrease faster. This likely happens because a covered pot traps steam, which condenses on the lid and drips back into the dish as mostly water, effectively diluting the remaining ethanol more rapidly even though less total liquid evaporates.
Wider, shallower cooking vessels expose more surface area to the air, which should help alcohol escape faster in principle. Stirring also brings alcohol-rich liquid to the surface. But the research suggests these factors matter less than simply cooking longer and reducing the overall liquid volume.
Practical Guidelines for Your Cooking
If your goal is to keep alcohol content as low as possible, time is your best tool. A dish that simmers for at least 2 to 2.5 hours will retain only about 5% of the alcohol you added. For a recipe calling for one cup of wine at roughly 12% ABV, that means the entire finished dish would contain the equivalent of less than a teaspoon of pure alcohol, spread across multiple servings.
For quick-cooked dishes like pan sauces, stir-fries with a splash of sherry, or pasta tossed with vodka sauce, a meaningful amount of alcohol remains. This is worth knowing if you’re cooking for someone avoiding alcohol for health, religious, or recovery reasons. The idea that “the alcohol all cooks off” is one of the most persistent myths in home cooking. It does cook off eventually, but eventually means hours, not minutes.