Chocolate Walnut Fudge

2 c Icing sugar
1 c Cocoa
1-1/2 Butter or margarine
1-1/2 Chopped walnuts
Walnut halves

Sift together icing sugar and cocoa. Melt butter in a saucepan. Continue cooking until buter is hot and bubbly. Remove from heat. Blend hot butter into cocoa mixture. Stir in chopped nuts. Spread in a greased 8 inch square cake pan. Garnish with walnut halves. Chill until set. Store in refrigerator.