INGREDIENTS
1
Candied lemon, Zest
4
Eggs, large
3 1/4 cups
All-purpose flour
1 1/2 tsp
Baking powder
3/4 tsp
Baking soda
1 cup
Bittersweet chocolate
10 tbsp
Cocoa powder, Dutch-process
1
Confectioners' sugar
42 tbsp
Granulated sugar
1 1/2 tsp
Salt, coarse
2 tbsp
Espresso, instant powder
1 cup
Espresso or very strong coffee
1
Cream, Lightly whipped
1 cup
Sour cream
3 sticks
Plus 2 tablespoons unsalted butter, room temperature