Originally Posted by
Shrike:
“Walter is right - grape juice has sugars in it that in wine are converted to alcohol. Much of the alcohol boils off but you get a very different flavour to what you would from using grape juice where the sugar will remain.
I always assumed all the alcohol went from the food, but on QI they maintained a lot stays - according to Wiki a lot does stay in many dishes.”
Aye, I remember that. It's amazing how little chefs know or what they spout without doing any real research.
Sealing in the flavours
All the alcohol will boil off
Don't eat unopened mussels
etc.
(

just jesting as i'm no food expert / scientist - those are just some of the common ones used all the time on food shows)
As for alcohol though iff you use a glass of wine in a dish that's going to serve 4 people then whatever alcohol is left isn't going to be a problem.