Anyone have a good OLD school Mahogany Cake recipe?

My grandmother and her ladies around SWLA used to make Mahogany Cakes. These memories are 35 years old, but I've never had anything quite like them. Chocolate and coffee flavors inside, and then a grey frosting that had almost a little crunch on the outside and then super dense and sweet the rest of the way. Then topped with chopped pecans. At least that is the way I remember it. If anyone could point me in the right direction it would be greatly appreciated.