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Preheat the oven to 350°. Area a 9-creep nonstick cake pan over moderate warmth. Add 4 tablespoons of the butter and when it’s melted, recede within the brown sugar except dissolved, about 1 minute. Agree with a ways from the warmth. Arrange the lemon slices within the melted brown sugar.
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In a medium bowl, accelerate the flour with the baking powder and salt. In a astronomical bowl, with an electrical mixer, beat the very most piquant 8 tablespoons of butter with the granulated sugar except gentle and fluffy. Beat within the vanilla and the egg yolks, one after the other. At low speed, beat within the dry substances in 3 batches, alternating with the milk.
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In a stainless metal bowl, beat the egg whites with the cream of tartar at excessive speed except agency peaks invent. Fold one-third of the overwhelmed whites into the batter, then fold within the the rest. Hassle the batter into the willing pan and bake for about half-hour, or except a toothpick inserted within the middle of the cake comes out successfully-organized. Let frosty within the pan for 15 minutes, then invert it onto a plate. Again warm or at room temperature with whipped cream.
