Chocolate Roll - cooking recipe

Ingredients

5 eggs, separated
1/2 tsp. cream of tartar
1 c. sugar
1/4 c. sifted flour
3 Tbsp. cocoa
1/4 tsp. salt
1 tsp. vanilla
1 quart of coffee or vanilla ice cream
1 sq. unsweetened chocolate
1 Tbsp. butter
1 c. confectioners sugar
2 Tbsp. boiling water

Preparation

Beat egg whites and cream of tartar till stiff but not dry. Gradually beat in 1/2 c. sugar.
Beat egg yolks till thick and lemon color.
Sift remaining 1/2 c. sugar with flour, cocoa and salt two times; fold into yolk till blended, add vanilla. Carefully fold yolk mixture into beaten egg whites.