Beat egg whites and salt until foamy in a large glass or metal mixing bowl until stiff peaks form. Lift your beater or whisk straight up: the egg whites should form a sharp peak that holds its shape.
Beat the egg yolks to soft peaks in a separate bowl. Beat the butter and confectioners' sugar in a large bowl until light and fluffy. Add the egg yolks and vanilla to the butter mixture; mix. Stir in the nutmeg, cloves, allspice, and the egg whites; beat until well blended. Batter can be frozen or kept in refrigerator for several weeks.
To make a Tom and Jerry, fill a cup of hot water with spiced rum or brandy, warm milk, hot cocoa, or eggnog and stir in 1 heaping tablespoon of batter.
