cream of tartar

Creme of Tartar (aka. Potassium bitartrate) is a postassium acid salt and has a variety of purposes. The one which we are probably most interested in, is its ability to stabalize egg whites to increase their volume.

The following recipes on this site use cream of tartar:

Tom and Jerry (batter mix)
eggs, rum, cinnamon, cloves, allspice, cream of tartar, sugar,