Beat potatoes, cream, lemon peel, juice, spices and egg yolks until smooth. Reserve ⅓ c. coconut; fold remaining coconut into sweet potato mixture.
Beat egg whites until soft peaks form; gradually beat in brown sugar to make a stiff meringue. Fold into sweet potato mixture. Spoon into buttered 2-qt. casserole; top with reserved 16 c. coconut and almonds.