1c butter, 2 eggs, 1/2c brown sugar, 1tsp vanilla, 1/4tsp salt, 2c flour ground nuts (for rolling).
Mix together butter, egg yolks, and remaining ingredients. refrigerate. Roll into 1 inch balls. Dip in egg whites and nuts. Bake350 for 5 minutes. Remove from oven and press thumb into center. Bake 8 minutes longer. Fill center with jelly.