Preheat your oven to 350°F (180°C). Butter a 9-inch springform pan.
In a stand mixer fitted with the paddle attachment, beat butter and granulated sugar at medium speed until pale and fluffy, about 5 minutes, stopping to scrape sides of bowl. With mixer on low speed, add eggs, one at a time, beating until combined after each addition.
In a medium bowl, sift together all-purpose flour, baking powder, and salt; add almond flour, and stir until combined.
In a small bowl, combine buttermilk and vanilla. With mixer on low speed, add flour mixture to butter mixture in two additions alternately with buttermilk mixture, beginning and ending with flour mixture, beating until combined after each addition.
In another medium bowl, combine three-fourths of strawberries and remaining 1 tablespoon all-purpose flour, gently tossing to coat. Fold into batter.
Pour batter into prepared pan, smoothing top with an offset spatula. Arrange remaining strawberries on top of batter. (Don’t push them in as they tend to sink.) Sprinkle with turbinado sugar.
Bake until golden and a wooden pick inserted in center comes out clean, 30 to 35 minutes. Let cool in pan for 10 minutes.
Remove from pan, and let cool slightly on a wire rack. Sprinkle with sliced almonds, and garnish with confectioners’ sugar, if desired. This cake is best served warm.
Store in an airtight container at room temperature for up to 2 days, or refrigerate in an airtight container for up to 5 days.