It is all about molecules, albumen, surface tension, blah blah blah.
Essentially, the albumen of the egg white will not form a stable foam with the presence of too much non-protien liquid such as water and alcohol, which are the principle ingredients in Vanilla Extract. If you want the flavor ad a bit of extract AFTER the whites are beaten to the degree of stiffness you are looking for. Of course, on the other hand, a bit of liquid will produce a nice light foam but it is really unstable and won't last too long and if it does will ultimately weep out. It is the wonderful world of baking.
Sounds like you need to get your hands on Shirley Corhior (spelling way not right) or Harold McGee (spelling ok). |