This dessert belongs in everyone's "outdoor entertaining" file. The cake squares, embellished with moist fruit and a crunchy topping, are meant to be eaten out of hand.
- Total Time:
- Yield: Makes 32 squares
Photography: Dana Gallagher
Source: Martha Stewart Living, May 2012
- Vegetable-oil cooking spray, for cake pans
- 1 pound plus 10 ounces rhubarb, trimmed and cut 1/2 inch thick on the bias
- 2 cups sugar, divided
- 2 cups all-purpose flour
- 1 1/4 teaspoons baking powder
- 1 teaspoon coarse salt
- 1 1/2 sticks unsalted butter, softened
- 1 teaspoon finely grated lemon zest
- 3 large eggs
- 1 teaspoon pure vanilla extract
- 1/2 cup sour cream
- 1 cup all-purpose flour
- 1/4 cup light-brown sugar
- 1/4 teaspoon coarse salt
- 1/2 stick unsalted butter, melted
Cake: Preheat oven to 350 degrees, with rack in center position. Coat two 9-inch square cake pans with cooking spray, and line with parchment, leaving an overhang on 2 sides. Stir together rhubarb and 1 cup sugar; set aside to macerate.
Whisk together flour, baking powder, and salt. Beat together butter, remaining cup sugar, and the lemon zest until light and fluffy. Beat in eggs, 1 at a time, then beat in vanilla. Beat in flour mixture in 2 additions, alternating with sour cream, beginning and ending with flour mixture.
Crumb topping: Stir together flour, brown sugar, and salt. Add melted butter; stir to combine.
Divide batter between pans. Top with rhubarb mixture, and sprinkle with crumb topping. Bake until golden on top and cooked through, about 1 hour 5 minutes. Let cool completely in pans on wire racks, then lift cakes from pans using parchment. Remove parchment. Before serving, cut buckle into 2-inch squares.