Sorry, Bruno, alcohol just doesn't burn off. Perhaps if you're the type that enjoys beer and such, it doesn't have a taste for you, but for me I can taste it every time. I'm not talking about low-end restaurants either, here.

I'm telling you, I've had the same reaction from everyone else I've told this to. Then one of those people came across an article about common cooking myths, which included the "it cooks off" myth. I'll see if I can find it.

Here's where I first saw it (halfway down the page). It took me a bit of searching, but you can find the information used for their chart at the USDA's site. It shows that even when flamed, only 25% of the alcohol evaporates.