INGREDIENTS
1 cup
pitted prunes, about 14
1 cup
boiling water, plus more for water bath
1 cup
unsweetened cocoa powder, sifted
1/2 tsp
baking soda
1/4 tsp
salt
4
large eggs
1/2 cup
sugar
1 tbsp
vanilla extract
3 oz
dark chocolate, finely chopped and melted (see *tip)