2 egg yolks
1/4 lb. butter
1 tbsp. lemon juice
3 tbsp. boiling water

Cut 1/4 pound butter in 3 pieces. Beat egg yolks in cold pot, add lemon juice and place over boiling water (very low fire). Beat fast and constantly. Add first piece of butter. When melted, add second piece; when melted, third piece. When melted, add 3 tablespoons boiling water. Cook 1 minute.