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Preheat oven to 450 degrees F.
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In a clean, dry mixing bowl, beat the egg whites and granulated sugar to firm, glossy peaks. Set aside.
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In a mixing bowl, sift together almond flour/meal, confectioner's sugar, and cake flour.
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Add whole eggs, one at a time, mixing well after each addition until batter is smooth and light.
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Fold in 1/2 of the whipped egg whites into batter, in two additions. (The first addition may seem hard to mix in. Don't worry, it gets easier. Goal is just to try to keep as much fluffiness as possible.)
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Fold in melted butter.
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Fold in remaining whipped egg whites, trying not to overmix and preserving the fluffiness and lightness of the batter.
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Remove your chocolate paste design from freezer. Paste should be very hard.
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Spread almond sponge batter evenly over top of paste.
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Bake cake for 5-7 minutes, or until sponge color changes slightly and cake bounces back when slightly pressed. Do not overbake! (Overbaking leads to cracking when assembling.)
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Remove from oven and cool for about 5 minutes, or until you can handle, but still a little warm. (Do not cool too long so that you can still easily remove from mat.)
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Invert cake over onto another cookie sheet lined with parchment or wax paper.
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Slowly and carefully pull back the non-stick mat to reveal the design.