Preparation / Directions:
Preheat oven to 350 degrees.
Melt chocolate in boiling water. Cool.
Cream butter and sugar until fluffy. Add egg yolks, one at a time, and beat well after each. Add melted chocolate and vanilla. Mix well.
Sift together flour, salt and soda. Add alternately with buttermilk to chocolate mixture; beat well after each addition. Beat until smooth.
Fold in egg whites. Grease and flour sides of 3 8 or 9-inch layer cake pans. Line bottoms with parchment paper. Pour batter into cake pans. Bake at 350 degrees for 30 to 40 minutes. Cool. Frost tops only.
FROSTING: Melt chocolate, blend in sugar, salt and hot water. Add yolk; beat well. Add butter, 1 tablespoon at a time, beating thoroughly after each. Stir in vanilla. Makes about 3/4 cup or enough to frost tops of two layers.