Raspberry Buttermilk Cake
Adapted from Gourmet, June 2009

Ingredients:
1 cup (125 g) all-purpose flour
1/2 teaspoon baking powder
1/2 teaspoon baking soda
1/4 teaspoon salt
1/2 stick (60 g) unsalted butter, softened
2/3 cup (135 g) plus 1 1/2 tablespoons sugar, divided
1/2 teaspoon pure vanilla extract
1 large egg
1/2 cup (120 ml) well-shaken buttermilk
1 cup (150 g/50 oz) fresh raspberries

Preparation:

Preheat oven to 400°F with rack in middle. Butter and flour a 9-inch round cake pan.

Whisk together flour, baking powder, baking soda, and salt.

Beat butter and 2/3 cup sugar with an electric mixer at medium-high speed until pale and fluffy, about 2 minutes, then beat in vanilla. Add egg and beat well.

At low speed, mix in flour mixture in 3 batches, alternating with buttermilk, beginning and ending with flour, and mixing until just combined.

Spoon batter into cake pan, smoothing top. Scatter raspberries evenly over top and sprinkle with remaining 1 1/2 tablespoons sugar.

Bake until cake is golden and a wooden pick inserted into center comes out clean, 25 to 30 minutes. Cool in pan 10 minutes, then turn out onto a rack and cool to warm, 10 to 15 minutes more. Invert onto a plate.