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Preheat the oven to 350°F. Butter and flour a 10-fade round cake pan.
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In a medium bowl, sift collectively the flour, baking powder, and salt. In a single more medium bowl, dash the melted butter with the olive oil and milk.
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In a immense bowl, the utilization of a handheld mixer, beat the eggs with the sugar and citrus zest unless pale and thickened, about 3 minutes. Alternately beat within the dry and moist substances, initiating and ending with the dry substances. Pour the batter into the willing pan. Bake for approximately Half-hour, unless the cake is golden brown and the side pulls a ways flung from the pan. Transfer the cake to a rack and let cool earlier than serving.
Manufacture Ahead
The cake will possible be stored at room temperature for up to 3 days.