Recipe: Rhubarb Upside-Down Cake
4 cups chopped rhubarb (from about 6 large stalks)
1 / 3 cup dark brown sugar
2 / 3 cup sugar
2 teaspoons finely grated lemon zest
1 cup flour
1½ teaspoons baking powder
¼ teaspoon kosher salt
6 tablespoons unsalted butter, softened (plus more for pan)
1 teaspoon vanilla extract
½ cup milk
1. Toss together rhubarb, brown sugar, 1 / 3 cup sugar and 1 teaspoon lemon zest.
2. Whisk together flour, baking powder and salt.
3. Using a stand mixer fitted with the paddle attachment, beat butter and remaining 1 / 3 cup sugar until light and fluffy, about two minutes. Scrape down sides of bowl. Slide in egg, remaining 1 teaspoon lemon zest and the vanilla extract; beat fluffy again. Scoop in one-third of the flour mixture; mix on low speed just to combine. Pour in half the milk; mix to combine. Repeat, working in remaining doses of flour, milk, flour.
4. Generously butter a 9-inch cake pan (not springform). Scrape in rhubarb and any juices. Scrape in cake batter; smooth top. Slide into a 350-degree oven and bake until golden and a toothpick poked in the center comes out clean, about 35 minutes. Cool 10 minutes. Run a knife around the edge of the pan. Set a serving plate over pan and flip cake, fruit-side up, onto the plate. Nice slightly warm.
— Chicago Tribune, inspired by Bon Appétit