Unsalted butter, for cake molds
2 tablespoons cocoa powder
3 ounces extra-bitter chocolate, finely chopped
3 ounces unsalted butter
2 eggs
2 egg yolks
3 ounces sugar
1 1/2 ounces all-purpose flour
Serving suggestion: Espresso Creme Anglaise, recipe follows
3 egg yolks
1/3 cup sugar
1 1/2 cups light cream
3 tablespoons brewed espresso