It's a bit of a long recipe, it's similar to traditional
chocolate cake recipes but with added ingredients, such as coconut.
Here's the link: http://www.mangerati.com/german-chocolate-cake
Where can you find a recipe to make German chocolate from scratch?
The recipe for German chocolate cake from the Joy of Baking is
linked below.
Did the Inca's make vegan chocolate cake?
No, they did not have the resources to make chocolate cake
(cocoa originally began as a drink similar to, but more bitter
than, hot chocolate) - let alone a vegan type of cake.