Frozen Pinwheel Cookies

1 c shortening   -Cream together
1 c white sugar
2 eggs
3 Tbsp milk                        Divide dough in half and add
3 c flour                          cocoa (enough to color dough)
3 tsp baking powder                to one part.  Roll out both
¼ tsp salt                         into sausage-like rolls.  Place
2 tsp vanilla                      one on top of the other and roll
                                   into one roll.  Refrigerate or
                                   freeze overnight.  Slice thin
                                   and bake at 325°