Upside-Down Blood Orange Cake

Preparation

1. Step 1

   Heat oven to 350 degrees. Grease a 9-inch round cake pan.

2. Step 2

   In a small saucepan over medium heat, melt 3 tablespoons (45 grams) butter. Add the brown sugar and lemon juice; stir until sugar melts, about 3 minutes. Scrape mixture into bottom of prepared pan.

3. Step 3

   Grate ½ teaspoon zest from one of the oranges, then slice off the tops and bottoms of both oranges. Place oranges on a clean, flat surface, and slice away the rind and pith, top to bottom, following the curve of the fruit. Slice each orange crosswise into ¼-inch-thick wheels; discard any seeds. Arrange orange wheels on top of brown sugar mixture in a single, tight layer.

4. Step 4

   In a large bowl, whisk together orange zest, cornmeal, flour, baking powder and salt. In a separate bowl, cream together remaining 2 sticks (225 grams) butter with granulated sugar. Beat in eggs, one a time, then beat in sour cream and vanilla. Fold in the dry mixture by hand.

5. Step 5

   Scrape batter into pan over oranges. Transfer to oven and bake until cake is golden brown and a toothpick inserted in the center emerges clean, 40 to 50 minutes. Cool cake in pan 10 minutes, then run a knife along pan’s edges to loosen it; invert onto a platter and cool completely before serving.