CITRUS-ALMOND SPONGE CAKE

Steps:

• For the Margarita Semifreddo
• Put twenty 2 x 2-inch ring molds on a tray and put them in the freezer at least 1 hour before you start to make the semifreddo.
• Stir the tequila, Cointreau, simple syrup, and lime juice and zest together to make the margarita base. Measure 2/3 cup (drink the rest).
• Pour about 3 tablespoons of the margarita base into a small glass bowl and sprinkle the gelatin over the surface. Let sit for about 1 minute, then microwave for 45 seconds or heat gently in a small saucepan until melted.
• Put the egg, egg yolks, and sugar in the bowl of a standing mixer. Set the bowl over a saucepan of simmering water-make sure the bottom of the bowl doesn't touch the water-and whisk until the sugar is melted and the mixture is hot. Whisk in the gelatin.
• Move the bowl to the standing mixer fitted with the whisk and whisk at medium-high speed until the mixture is pale and light and the sides of the bowl are cool.
• In a separate bowl, whip the cream to medium peaks.
• Fold about half of the remaining margarita base into the eggs. Fold in half the cream, then repeat, folding in the remaining base and the cream, gently but thoroughly.
• Fill a pastry bag and pipe the semifreddo into the ring molds (see Note), leaving about 1/3 inch of headroom. Cover with plastic wrap and freeze for at least 2 hours before serving.
• For the Sponge Cake
• Heat the oven to 375°F or 350°F on convection. Spray eight to nine 1-ounce aluminum timbale molds with cooking spray and coat them with sugar (vanilla sugar, page 185, would be best). Set the molds on a baking sheet.
• In a small bowl, rub the sugar, orange and lemon zests, and vanilla seeds (rinse, dry, and save the pod for another use) together with your fingers.
• Whisk the almond flour, cornstarch, and salt together.
• Put the egg and egg yolk in the bowl of a standing mixer fitted with the whisk. Whisk at medium speed until frothy. Add the sugar mixture and beat at medium-high speed until light and doubled in volume. Add the dry ingredients gradually, scraping the sides of the bowl as needed. Increase the speed to high and beat until the batter regains its original volume, about 3 minutes. You can prepare the batter about 2 hours in advance. Cover the bowl with plastic wrap and refrigerate it right away.
• If you've made the batter in advance, whisk it again on high speed for about a minute. Fill a pastry bag and pipe the batter into the molds, filling them about two-thirds full. Bake until puffed, golden, and firm, about 11 minutes. Rotate the pan halfway through baking.
• Unmold the cakes right away. You'll need to nudge them out of the molds with a small knife. Serve them warm.
• To Serve
• Mix the orange zest and sugar together in a small bowl. Dip the tops of the warm sponge cakes into the sugar and set them on small plates. Garnish with the candied kumquats and lemon zest. Unmold the margarita semifreddos by rubbing each mold briskly between your palms and then pushing the semifreddo out of the mold. Add them to the plates.