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Chocolate Sponge Cake
3/4 cup (100 g) cake and pastry flour 2/3 cup (140 g) granulated sugar 1/4 cup (30 g) Dutch process cocoa powder 1/2 tsp (2.5 g) baking soda 1/4 tsp (1.25 g) salt 1/4 cup (60 g) cool unsalted butter, cut into pieces 1/4 cup (60 mL) hot, strongly-brewed coffee 1/4 cup (60 mL) milk 1 large egg, at room temperature 1 tsp (5 mL) vanilla extract