Heat oven to 350° F. In medium bowl, cream together sugar, butter, and cocoa. Beat in remaining ingredients. Blend until smooth. Drop dough by teaspoonfuls onto a greased cookie sheet. Bake for 10 to 15 minutes, or until cookies are set. Remove cookies to wire racks to cool and prepare the following frosting.
Frosting:
*Combine all frosting ingredients, blending until smooth. Frost cooled cookies.