Preheat oven to 350°F and lightly spray a 9-inch spring form pan with nonstick spray. Set aside.
In a medium-sized bowl, whisk together the flour, baking powder, and salt. Set aside.
1½ cups all-purpose flour, 1 teaspoon baking powder, ½ teaspoon kosher salt
In a large mixing bowl, using a hand mixer, cream the butter and ¾ cup sugar together until light and fluffy, about 3-4 minutes. Scrape down the sides of the bowl as needed.
6 tablespoons unsalted butter, 1 cup granulated sugar
Beat the eggs in, one at a time, then beat in the lemon juice, lemon zest, and orange zest.
3 large eggs, 1 tablespoon freshly squeezed lemon juice, 1 tablespoon lemon zest, 2 tablespoons orange zest
Stir together the sour cream and buttermilk.
¼ cup sour cream, ¼ cup buttermilk
Add the flour mixture to the butter mixture, alternately, along with the sour cream/buttermilk mixture; begin and end with the flour mixture.
Mix just until the flour is incorporated.
Fold in the strawberries and pour the batter into the prepared baking pan. Smooth the top and sprinkle with the remaining ¼ cup granulated sugar.
12 ounces fresh strawberries
Bake at 350°F for 35-45 minutes, or until a toothpick inserted in the center comes out clean. The top should be golden, slightly crackled, and should not jiggle.
Transfer the cake to a cooling rack and allow to cool 10 minutes. Run a thin knife along the edge to loosen any sticking edges. Remove the outer ring of the springform pan and cool the cake completely before slicing.