Though I got my idea for the flavor combinations from here - earl grey chocolate cake + lavender frosting - I didn't follow her recipe. I adapted a cake recipe I've used many times before and added the earl grey tea. I loved the taste, though the texture was a little bit dry; I'm going to do a v.2 this weekend using sour cream instead of the yogurt. That should help.
2 C chipped unsweetened dark chocolate
1/2 C (1 stick) butter
2/3 C organic buttermilk
1-1/2 C organic brown sugar (I didn't pack the sugar, I think I will next time)