Preheat the oven to 375 degrees Fahrenheit.
Use coconut oil to very lightly grease the pan.
1 tbsp coconut oil
In a large sized bowl, sift flour.
1 cup cake flour
Sift powdered sugar into the same bowl. Set to the side.
1/2 cup powdered sugar
In another large bowl, crack and egg and drizzle the egg white into the bowl. Best way to do this is to crack the egg into two pieces and carefully transfer the yolk back and forth from one shell piece to the other so that the egg white lightly falls into the bowl. Throw away the yolk. Do this for all 12 eggs, and add to the bowl.
12 large egg whites
Using a hand mixer, beat at maximum speed for 2 minutes.
Add cream of tartar. Beat until the egg whites get stiff. Move the beater back and forth, front to back, to make peaks with the egg whites.
1 1/2 tsp cream of tartar
Add 1/2 of the raw sugar, continue beating the egg whites with the hand mixer until well combined. Add the other half of the raw sugar. Add the vanilla extract.
1 1/4 cup raw sugar, 3 tsp vanilla extract
Continue beating the egg whites until they are well combined and have formed stiff peaks.
Add egg whites into the large bowl with flour and powdered sugar. Combine gently with a rubber spatula, folding into the flour.
Put cake batter into the bundt pan. Smooth top with spatula.
Bake for 35 minutes until toothpick comes out cleanly.
Allow to cool slightly, until safe to flip over bundt cake pan to remove cake. Use a butter knife to lightly loosen cake and remove from pan.