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1
Preheat oven to 350u00b0F. Line the bottom of a 10″ round cake pan with parchment or wax paper. Lightly oil the pan and dust with cornmeal, shaking out the excess.
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2
In a medium sized bowl, sift together cornmeal, flour, baking powder and salt and set aside. In a large mixing bowl, whisk together sugar, oil, and butter until well combined. Add eggs and egg whites, one at a time, stirring until just combined.
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3
In a small bowl, stir together yogurt, lemon zest, juice, and extract. Fold into the sugar mixture until just combined. Fold in the dry ingredients until just combined. Do not overmix.
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4
Place the batter in the prepared pan and smooth the top with a rubber spatula. Bake for about 40 minutes, or until the cake is golden and a toothpick inserted in the center comes out clean. Cool for 10 minutes on a rack, invert the cake, peel off the paper and cool completely.
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5
(The cake can be made ahead to this point and refrigerated, wrapped in plastic, for up to 3 days.).
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6
Cut the cake into wedges and serve, topped with the berries.