INGREDIENTS
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1 pound plus 3 ounces bittersweet chocolate such as Lindt, broken into chunks
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10 tablespoons (1 1/4 sticks) unsalted butter, cut into pieces, at room temperature
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1 tablespoon Cup 4 Cup gluten-free flour
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1 1/2 tablespoons sugar
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1 teaspoon instant coffee granules
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1/4 teaspoon kosher salt
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4 extra-large eggs, at room temperature, separated
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1/4 cup heavy cream
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Coffee or vanilla ice cream, for serving
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Preheat the oven to 425 degrees. Grease an 8-inch springform pan and line the bottom with parchment paper.
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Place the one pound of chocolate in a large heat-proof bowl set over a pan of simmering water and stir occasionally until the chocolate is melted. Off the heat, immediately stir in the butter, flour, sugar, coffee granules, and salt with a rubber spa
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Place the egg whites in the bowl of an electric mixer fitted with the whisk attachment and beat until they form soft peaks. Scrape the egg whites into the chocolate mixture and fold them in very carefully with a rubber spatula, just until combined. S
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Turn the oven off and leave the cake in the oven, leaving the door slightly ajar. Allow the cake to cool in the oven for 1 hour. The cake will sink in the middle.