1 small package instant vanilla pudding
1 cup cold milk
1 baked and cooled yellow cake, layer and split horizontally
2 oz squares unsweetened chocolate
2 tablespoons butter
1 cup powdered sugar
1 teaspoon vanilla
4-5 tablespoons hot water

Prepare pudding mix as package directs using milk and spread between cake layers. In small saucepan, over low heat, blend chocolate and butter until melted. Remove from heat and blend in sugar and vanilla. Gradually stir in enough water until reaching a glaze consistency, drizzle over the cake.