Makes 4 dozen
Beat egg whites and salt until frothy and just beginning to get dry. Add cream of tartar and beat a little more. Fold the sugars into the mixture with a rubber scraper, a tablespoon at a time. Add vanilla.
Sift the flour and baking powder together and fold with the ground almonds gently into the mixture. Drop be teaspoonsful on greased cookie sheets.
Bake in a slow oven, preheated to 325 degrees, about 35 minutes, or until a mellow brown. While warm remove carefully from sheets with a knife.