Lemon Upside-Down Cake

将烤箱预热至350°。设置一个9英寸的不粘蛋糕锅中温度。加入4汤匙黄油，当它熔化时，在红甘油中搅拌直至溶解，约1分钟。从热量中取出。在熔化的红糖中安排柠檬切片。

In a medium bowl, whisk the flour with the baking powder and salt. In a large bowl, with an electric mixer, beat the remaining 8 tablespoons of butter with the granulated sugar until light and fluffy. Beat in the vanilla and the egg yolks, one at a time. At low speed, beat in the dry ingredients in 3 batches, alternating with the milk.

In a stainless steel bowl, beat the egg whites with the cream of tartar at high speed until firm peaks form. Fold one-third of the beaten whites into the batter, then fold in the rest. Scrape the batter into the prepared pan and bake for about 30 minutes, or until a toothpick inserted in the center of the cake comes out clean. Let cool in the pan for 15 minutes, then invert it onto a plate. Serve warm or at room temperature with whipped cream.