Sea Foam Frosting

• 2 egg whites
• 3/4 cup brown sugar
• 1/3 cup corn syrup
• 2 tablespoons water
• 1/4 teaspoon cream of tartar
• 1/4 teaspoon salt
• 1 teaspoon vanilla

Cook all ingredients except vanilla in a double boiler, beating constantly, until mixture stands in peaks. Remove from heat, add vanilla, beat until thick enough to spread.