Beat yolks with sugar, orange rind until fluffy. Sift together flour, baking powder. Mix into it the crumbs and walnuts. Blend into the yolk mixture. Fold in beaten egg whites (soft peak). Bake in a 17 x 11 flat pan brushed with melted crisco. Line only bottom with waxed paper, brush this also. Bake 350 degrees - 30 minutes. Loosen edges and immediately turn out on a towel sprinkled with powdered sugar. Pull off wax paper and roll up (the wider width). Cool. Unrol and spread with the following filling: 1 cup crisco 1 cup sugar 1 orange (juice, rind) 1 cup milk 6 Tbsp flour 1 tsp vanilla In top of double boiler mix the juice, rind, flour and enough milk to make a smooth paste. Atir inthe rest of the milk slowly and cook until smooth and thick stirring constantly. Cool. Cream the crisce and the sugar intil fluffy. Add the vanuilla and the custard. Whip light and fluffy. TAke out 1 cup of filling, and ad 1 Tbsp cocoa, USe to frost outside of the roll. Chill both 1 hour.