For the blueberry filling
01 -
4 cups (600 g) fresh blueberries, or frozen blueberries kept frozen
02 -
1/2 cup (100 g) granulated sugar
03 -
1 1/2 tablespoons cornstarch
04 -
1 tablespoon fresh lemon juice
05 -
1 teaspoon finely grated lemon zest
06 -
1 teaspoon vanilla extract
07 -
1/4 teaspoon fine salt
08 -
1 tablespoon unsalted butter, for dotting the filling
09 -
Butter, for greasing the baking dish
For the biscuit topping
10 -
1 1/2 cups (190 g) all-purpose flour
11 -
1/4 cup (50 g) granulated sugar, plus 1 tablespoon for sprinkling
12 -
2 teaspoons baking powder
13 -
1/2 teaspoon fine salt
14 -
6 tablespoons (85 g) cold unsalted butter, cut into small cubes
15 -
3/4 cup (180 ml) cold buttermilk
16 -
1/2 teaspoon vanilla extract
For serving
17 -
Vanilla ice cream or whipped cream, optional