Buttermilk Mango Upside Down Cake

• 8 tablespoons unsalted butter - room temp (1 stick)
• 1/2 cup light brown sugar
• 2 tablespoons dark rum (Plantation or Mt Gay Eclipse are good)
• 1 1/4 cups cake flour
• 1/4 cup coconut flour
• 2 teaspoons baking soda
• 1/2 teaspoon salt
• 1 cup buttermilk
• zest and juice from 1 lime
• 2 atulfo mangos
• 2 eggs - separated
• 1/2 cup sugar (3/4 c for a sweeter cake)

1. Flour and butter a 9" cake pan. Line the bottom with parchment paper and butter that too. Preheat the oven to 350.
2. Peel and slice the mango. I used the "cheeks" of the mangos sliced into moons. I also ate some along the way. So 2 mangos is more than enough. Arrange the slices in a circle in the cake pan.
3. Melt 3 tbs of butter with the light brown sugar. Cook it over medium heat until it begins to bubble, and stir for 2-3 minutes. Turn off the heat and stir in the rum. Stir until it is smooth and fully mixed, then pour it slowly over the mangoes, making sure that the spaces between the mangoes are filled with goodness
4. Whisk the egg whites until soft peaks form. Whisk together the dry ingredients - except the sugar.
5. Beat the butter and sugar together until it is smooth. Beat in the egg yolks, again until smooth. Then beat in the lime juice, lime zest, and buttermilk. Now slowly beat in the dry ingredients until the batter is smooth. Gently fold in the egg whites. Now spread the batter over the mangos in the cake pan.
6. Bake for 40-45 minutes, until the cake is golden and a tester comes out clean. Cool for several minutes, then invert onto a plate. You should allow it to cool more before you eat it, but you probably won't!!!

light brown sugar, dark rum, cake flour, coconut flour, baking soda, salt, buttermilk, lime, atulfo, eggs, sugar

Taken from food52.com/recipes/17105-buttermilk-mango-upside-down-cake (may not work)