Most alcohol also has flavor. When you cook with it, you’re trying to add that particular flavor to the dish; for example, I may want pasta sauce to have the taste of white wine as part of the flavor profile. Or I want to add a bourbon flavor to my BBQ sauce.
Yes the alcohol generally cooks off, but the point wasn’t to make the food boozy. The flavor will stay even after the alcohol cooks off.
There are a number of flavour molecules that are only alcohol soluble, and if you don’t have alcohol present in the cooking those flavours will remain locked up in the ingredients and not spread to the whole dish.
A tomato sauce is probably the easiest and clearest example. If you do a sauce of just tomatoes and water it will be ok. But if you just add 30ml of vodka to the cooking process it will taste a LOT more tomatoey and be significantly nicer.
You’re just cooking the alcohol off whatever you’re using. Once you cook off the alcohol off a spirit it adds depth of flavor to the dish.
Cooking the alcohol out of wine will result in a nicely flavored fermented grape juice that can reduced into a sauce.
Beer has sugar and will give a nice hoppy flavor. It’s also carbonated which will give a nice airy crispy batter when fried such as fish and chips.
This goes on and on with other alcohols like cognac, whisky, vodka and so on. They have all unique flavors once the alcohol is gone.
The extent to which alcohol is “cooked off” is _greatly_ exaggerated in popular consciousness.
Here’s a chart:
|Time Cooked at Boiling point of alcohol|Approximate Amount of Alcohol Remaining|
:–|:–|
|15 minutes|40 percent|
|30 minutes|35 percent|
|One hour|25 percent|
|Two hours|10 percent|
|Two and one-half hours|5 percent|
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