Amaretto Fudge Sauce:
Prepare as directed, except stir in 2 to 3 tablespoons amaretto, coffee liqueur, dark rum, crème de cacao, or brandy with the vanilla.
Espresso Fudge Sauce:
Prepare as directed, except stir in 1 to 2 tablespoons instant espresso coffee powder or instant coffee crystals with the vanilla.
Peanut Butter Fudge Sauce:
Prepare as directed, except stir in 1/2 cup creamy or chunky peanut butter and 1/4 teaspoon ground cinnamon with the vanilla.