Instructions

1. 1

   Preheat the oven to 425°F and line a baking sheet with parchment paper. Cold butter is essential here, so keep it refrigerated until the moment you need it.

2. 2

   Make the biscuit dough. Whisk the flour, sugar, baking powder, and salt together in a large bowl. Drop in the cold butter cubes and work them in with a pastry cutter or your fingertips until the mixture looks like coarse crumbs with some pea-sized butter pieces still visible — those pockets of butter are what create flaky layers.

3. 3

   Add the wet ingredients. In a small bowl, whisk together the buttermilk, eggs, and vanilla. Pour into the flour mixture and stir with a fork just until the dough comes together in shaggy clumps. Stop before it looks smooth — overworking makes tough biscuits.

4. 4

   Shape and cut. Turn the dough onto a lightly floured surface and pat it to about ¾-inch thickness. Use a 3-inch round cutter (or a drinking glass) to stamp out 8 biscuits, pressing straight down without twisting. Gather scraps gently and cut any remaining rounds. Place on the prepared baking sheet, sprinkle tops with turbinado sugar, and bake for 13–16 minutes until the tops are golden brown and the bottoms sound hollow when tapped.

5. 5

   Macerate the berries while the biscuits bake. Toss the sliced strawberries with sugar and lemon juice in a bowl and let them sit at room temperature. After about 15 minutes they'll release a ruby-red syrup that soaks into the biscuits later — this is what makes every bite juicy instead of dry.

6. 6

   Whip the cream. Using a chilled bowl and chilled beaters, whip the heavy cream, powdered sugar, and vanilla on medium-high speed until you get firm peaks that hold their shape when you lift the beater. Stop just before the cream looks grainy.

7. 7

   Assemble. Split each cooled biscuit in half horizontally. Spoon macerated strawberries and their juices over the bottom half, add a generous cloud of whipped cream, scatter blueberries on top, then cap with the biscuit lid. Arrange the berries so the red strawberries and blue blueberries are clearly visible against the white cream — that's where the patriotic flag effect comes from.