1 c. sugar
1/3 c. hot water
1 tsp. lemon juice
1 egg white
1/8 tsp. cream of tartar
1 tsp. vanilla

Boil sugar and water until it threads; pour on to the beaten egg white, pouring in a steady stream and very slowly, adding, while beating, cream of tartar, lemon juice and vanilla; stir until thick. Spread on cold cake.