It’s a misconception that all the alcohol disappears. It really depends how you are cooking it and for how long. If you add brandy to a peppercorn sauce in a pan and simmer for 5 mins your going to have more left than if you leave it simmering for 30 mins. Even burning off the alcohol, say, on a Christmas pudding, leaves you with a decent whack of booze. It flavours the food, can aid cooking if you flambe and is a good solvent for sneaking ingredients into sauces.
Flavour.
It doesn’t always work, but when it does, there is a distinct flavour that comes with cooking some things with some alcohol. One that worked well for me recently was leaving some steaks to marinade in whisky (nothing outrageously expensive, £35/750ml) for a couple of hours. Cooked it and you could definitely taste whisky element – and was noticeably more tender than usual, which when you buy cheaper tougher steaks is a nice change!
Same as when I do red wine gravy, even with a cheaper bottle (£7/750ml); it’s distinctly flavoursome.
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