It is one of the most repeated lines in any kitchen. Add the wine, let it cook, and do not worry because the alcohol all burns off. People say it to reassure a pregnant guest, a friend in recovery, or a parent serving dinner to kids. It sounds obviously true, since alcohol evaporates and the pan is hot. The trouble is that it is not true, at least not in the way people mean it. A good amount of alcohol can survive cooking, and how much survives depends entirely on how you do it.
This is not a matter of opinion or old kitchen lore. The United States Department of Agriculture actually measured it and published the results in a table of nutrient retention factors. Researchers cooked foods with alcohol using different methods and then tested how much remained. What they found is that heat alone does not clear it out. The amount left behind swings widely based on the technique and, more than anything else, the time spent on the stove. The single word cooked hides a huge range of real outcomes.
Start with the methods that keep the most alcohol, because they tend to surprise people. If you stir a splash of liquor into a hot dish and then take it off the heat, roughly 85 percent of the alcohol is still there. A dramatic flambe, where you actually set the pan on fire, burns off less than you would think and leaves around 75 percent behind. A sauce made with alcohol and simply stored overnight without cooking holds about 70 percent. In other words, a quick flame or a brief stir does almost nothing. The alcohol mostly stays right in the food.
The number only drops in a real way when you give it time. Bake or simmer a dish for about 15 minutes and roughly 40 percent of the alcohol remains. Keep it going for half an hour and you are near 35 percent. From there it falls slowly, reaching about 25 percent after a full hour and around 20 percent after 90 minutes. You have to simmer for two hours to get down near 10 percent, and even two and a half hours still leaves close to 5 percent. Removing all of it is nearly impossible in a normal recipe.
The reason comes down to some simple chemistry. Alcohol does boil at a lower temperature than water, so some of it does leave the pan as vapor. But alcohol and water mix together and cling to each other, so they evaporate as a blend rather than the alcohol politely leaving first. To drive most of it out, you need sustained heat, a wide surface for the vapor to escape, and plenty of time. A tall covered pot traps it, and a fast sear or a flambe ends long before much can leave. That is why a long braise removes far more than a quick sauté ever will.
A few factors decide where your dish lands. A wide, shallow pan exposes more surface, which lets more alcohol escape. Stirring helps by bringing fresh liquid up to the surface. Longer cooking time matters most of all. On the other end, a lid keeps the vapor in, a small deep pot slows evaporation, and any dish where the alcohol is added at the very end holds onto nearly all of it. Desserts are the clearest example, since something like a boozy tiramisu or a spiked whipped cream is never cooked at all.
For most people, none of this is a problem, and a wine sauce now and then is nothing to fear. The people who should pay attention are specific. Doctors advise that there is no known safe amount of alcohol during pregnancy, so a dish braised for only 15 minutes may not be as clear as it looks. Anyone avoiding alcohol as part of recovery deserves that same honesty, because trace amounts can still matter to them personally. And a dish you would not think twice about could carry more than expected when it is served to a young child. The point is simply to know, not to panic.
So treat the old line as a rough guide, not a guarantee. Cooking with wine, beer, or spirits is perfectly fine for the vast majority of meals, and the flavor it adds is real. Just drop the belief that the alcohol vanishes the second it hits the heat. If it genuinely matters for you or for someone at your table, there are easy answers. Simmer the dish long and uncovered to push the number down, or leave the alcohol out and reach for broth, juice, or a splash of vinegar instead. Knowing what stays in the pot lets you make that call on purpose rather than on faith.
