Pit prunes and mash. Blend in lemon peel and lemon juice, 2 tablespoons
sugar and salt. To stiffly beaten egg whites, add remaining sugar, beating
until mixed well. Fold in prune mixture gently.
Pile lightly into 1-1/2 quart baking dish. Bake at 350 degrees for
20-30 minutes or until knife inserted in center comes out clean. Serve warm
with custard sauce if desired.