Best Answer: Pound cake is so buttery and rich that I don't put icing on it; sometimes, just powdered sugar. If I was going to ice it I'd probably just drizzle a royal icing. Royal Icing. 2 large (60 grams) egg whites. 2 teaspoons fresh lemon juice. 3 cups (330 grams) confectioners (powdered or icing) sugar, sifted.