Ebony, or black, cocoa powder is a very dark colored Dutched cocoa powder. It is available online at baker's supply stores like King Arthur Flour. You can substitute regular Dutched cocoa for more flavor but a paler color.
1 9x13 cake
Preheat oven to 350 degrees.
Grease and flour a 9x13 cake pan
Combine dry ingredients and mix thoroughly. Combine wet ingredients in a separate bowl. Combine bowls, and blend until smooth. It will be a thin batter. Bake 35-40 minutes.
Mix the sugar and butter, stir in vanilla and milk. Beat until smooth. Spread frosting over a cooled cake and sprinkle with lightly crushed cacao nibs.
If frosting is too thick, add a little extra milk.
Photo by Laurianna Williams.