Ye Olde Curiosity Shoppe Cake 'N' Frosting - cooking recipe

Ingredients

1/4 c. cocoa
1 oz. bitter chocolate
1/2 c. boiling water
1 tsp. baking soda
1/2 c. butter (do not substitute margarine)
2 c. light brown sugar
2 eggs
2 1/2 c. sifted cake flour (do not substitute)
1 c. buttermilk
4 Tbsp. butter (not margarine)
4 Tbsp. cocoa
2 c. confectioners sugar
3 Tbsp. milk
1 egg yolk (if desired)
dash of salt
1 tsp. vanilla

Preparation

Cream as follows:
First, cream the margarine until fluffy; stir in cocoa.
Sift sugar and add gradually to creamed mixture, beating constantly.
Stir in enough milk to make the right consistency for spreading.
One can add 1 egg yolk and beat in well at this time, if desired, for extra smoothness.
Stir in salt and vanilla.
Spread on cooled cake.