Preheat your oven to 350°F. Make sure your angel food cake pan is clean and ungreased.
Separate the egg whites from the yolks and save the egg yolks for another recipe. Make sure you don't get any yolk in the whites while you separate them!
Sift ¾ cup of the sugar and the flour at least two times. Set aside.
In the bowl of a stand mixer with the whisk attachment, beat the egg whites, cream of tartar, and salt until frothy on medium speed.
While beating the egg whites, gradually add the remaining ¾ cup of sugar, a tablespoon at a time. Add the vanilla extract.
Beat the egg whites until stiff peaks form. Use a spatula to fold in a third of the flour mixture at a time. Be careful not to overmix and deflate the egg whites., but make sure all the flour is incorporated.
Pour the batter into the angel food cake pan. Smooth the top with a spatula.
Bake for 40 to 45 minutes or until the top is golden brown and a toothpick comes out clean.
Remove the cake from the oven and immediately invert the pan onto a bottle or a raised surface. Allow the cake to cool completely in this position.
Run a knife around the edges and center tube to loosen the cake. Gently remove it from the pan. Slice with a serrated knife for best results. Serve with whipped cream and strawberries.