1/2 cup heavy cream
1/4 cup sugar
1/4 cup water
1/2 cup smooth peanut butter
1 tablespoon corn syrup
Pinch sea salt
1/8 teaspoon vanilla extract
1 cup (2 sticks) unsalted butter, cut into chunks
6 ounces high-quality unsweetened chocolate, coarsely chopped
2 ounces bittersweet chocolate, coarsely chopped, plus 4 ounces
1 teaspoon espresso powder
4 large eggs
1 1/2 cups granulated sugar
1/2 cup packed light brown muscavado sugar
2 teaspoons pure vanilla extract
1/4 teaspoon fine salt
1 cup unbleached all-purpose flour