Blackberry-Swirl Pound Cake
a jar blackberry jam
1/2 cup unsalted butter, room temperature
6 ounces blackberries (1 1/3 cups)
1 1/4 cups plus 2 T sugar
1 1/2 cups self-raising flour
2 large eggs, slightly beaten
1/2 tsp pure vanilla extract
1/2 cup sour cream, room temperature
1. Preheat oven to 350. Lightly butter a 5-by-9-inch loaf pan and line with parchment, leaving a 2-inch overhang.
2. In a food processor, puree blackberries with 2 T sugar. In a medium bowl, whisk together flour, salt, and baking powder.
3. In a large bowl, using an electric mixer, beat together butter and 1 1/4 cups sugar until light and fluffy, 5 minutes. Add eggs and vanilla and beat to combine, scraping down bowl as needed. With mixer on low, add flour in 3 additions, alternating with sour cream, beginning and ending with flour mixture.
4. Transfer half the batter to pan and dot with 1/2 cup blackberry puree. Repeat with remaining batter and puree. With a skewer or thin-bladed knife, swirl batter and puree together. Bake until golden brown and a toothpick inserted in center of cake comes out clean, about 1 1/4 hours. Let cool in pan on a wire rack 30 minutes. Lift cake out of pan and place on a serving plate. Let cool completely. cutting the top off cake making a well in the cake and adding blackberry jam on top before slicing.