1 c. water
3 c. granulated sugar
1/4 c. corn syrup (Karo)
12 lg. marshmallows
3 egg whites
1 tsp. vanilla
1 1/2 c. coconut flakes

Cook water, sugar, corn syrup over low heat until mixture reaches 250 degrees on candy thermometer or until it spins a thread. Add marshmallows, beat into cooked mixture until mixed thoroughly. Pour this mixture over beaten egg whites; add vanilla and beat until thick enough to spread. You may mix coconut in icing or top each layer with coconut. Makes enough icing to frost 3 layers or large sheet cake.