INGREDIENTS
For the cupcakes:
1/2 cup
plus 1 tablespoon Dutch-process cocoa powder
1/2 cup
plus 1 tablespoon hot water
2 1/4 cups
all-purpose flour
3/4 tsp
baking soda
3/4 tsp
baking powder
1/2 tsp
salt
2 sticks
plus 1 tablespoon unsalted butter, at room temperature
1 2/3 cups
sugar
3
large eggs, at room temperature
1 tbsp
vanilla extract
3/4 cup
sour cream
For the filling:
2 1/2 cups
sugar
2/3 cup
water
1 tbsp
light corn syrup
3/4 cup
heavy cream, warmed
2 1/4 tsp
sea salt, preferably fleur de sel
For the frosting:
1 1/4 cups
sugar, divided
5 tbsp
water
5 tbsp
heavy cream
Generous pinch of sea salt, such as fleur de sel
5
large egg whites
3 3/4 sticks
unsalted butter, at room temperature
To finish:
Vanilla bean caramels