Mary Jane’s recipe is based on one by the Barefoot Contessa (Ina Garten), but the shoeless TV cook wouldn’t dare to use red chile powder! You will need a springform pan for this cake since it would be difficult to get it out of a regular cake pan in one piece. You can use semisweet chocolate instead of bittersweet in the filling and the cake will be slightly sweeter. Maybe a scoop of ice cream on the side when you serve it to guests?
In Australia, we use a long loaf of Turkish bread for these sandwiches, but you can use Mexican bolillos or even Kaiser rolls. As you might expect, the sauce is the secret ingredient. The sandwiches can be assembled, wrapped in plastic wrap and refrigerated overnight for grilling the next day if desired.