1 c. flour
1 tsp. baking powder
1 tsp. salt
3 lg. eggs, beaten
1 c. sugar
1/3 c. water
1 tsp. vanilla
Powdered sugar

FILLING:

1/2 c. sugar
1 tbsp. cornstarch
1/4 c. cocoa
1/4 tsp. salt
1 c. milk
1 egg yolk, beaten
1 tbsp. butter
1 tsp. vanilla

Preheat oven to 375 degrees. Grease 15 1/2 x 10 1/2 inch pan lined with brown paper greased. Blend first 3 ingredients together, gradually beat sugar into eggs. Add water and vanilla. Slowly mix in flour mixture until smooth. Pour into pan. Bake 12 minutes. Loosen edges invert on towel sprinkled with powdered sugar. Remove paper trim off stiff edges. Roll cake and towel. Cool on wire rack, unroll, spread with filling roll again without towel.

Filling: Mix 1st 4 ingredients in pan gradually stir in milk. Bring to boil over medium heat, stir constantly. Boil 1 minute. Remove from heat. Add remaining ingredients. Cool, stirring constantly.