¼poundunsalted butter, cut into pieces; more for the pan(114 grams)
4largeeggs, room temperatureat room temperature
½cupsugar
¼cupbrewed espresso or double-strength coffeecooled to room temperature
1tbsp.sifted finely ground espresso beans
¼tsp.salt
¼cupall-purpose flour; more for pan(35 grams)
Instructions
Heat oven to 350°F. Butter an 8-inch cake pan and line the bottom with kitchen parchment paper. Butter the parchment paper and lightly dust the pan with flour, shaking off any excess.
In a small, heavy-bottomed saucepan over medium heat, melt the chocolates and butter, stirring frequently. Set aside.
Using the whisk attachment of a stand mixer, whip the eggs, sugar, brewed espresso, ground espresso beans, and salt on medium-high speed until thick and voluminous, at least 8 minutes. Turn the mixer to low and mix in the butter-chocolate mixture. Turn off the mixer.
Sift the flour over the batter and fold until all the ingredients are fully incorporated. Pour the batter into the prepared pan and bake until a skewer inserted in the center of the cake comes out clean, 25 to 30 minutes.
Cool in the pan on a rack for 10 minutes. Set a plate over the torte and carefully invert the torte onto the plate; peel off the parchment. Flip the torte back onto the rack to cool completely before slicing.