INGREDIENTS
4
Egg whites, large
4
Eggs plus one egg yolk, large
1 3/4
cups All-purpose flour
1 tsp
Baking soda
8 oz
Bittersweet chocolate
1/2 cup
Brown sugar, packed light
12 oz
Chocolate, semisweet
2/3 cup
Cocoa, Dutch-process
1 2/3 cups
Granulated sugar
1 1/4 tsp
Salt
3 tsp
Vanilla
1/2 cup
Vegetable oil
1 tbsp
White vinegar
2 tsp
Espresso, instant powder
3 sticks
Butter, unsalted
1 cup
Sour cream
1 cup
Water