Heat oven to 400°F. Line a large baking sheet with parchment paper.
Whisk flour, sugar, baking powder, and salt in a large bowl.
Cut in the cold diced butter until coarse crumbs form with pea-sized bits.
Gently toss in strawberries and lemon zest to coat with the flour mixture.
Stir the cold cream and vanilla together, then drizzle over the dry mixture.
Fold just until a shaggy dough forms. If dry, add a spoonful more cream.
Turn dough onto a lightly floured surface. Pat into a 7½-inch round, about 1 inch thick.
Chill the disk 10 minutes to firm up, then cut into 8 wedges.
Arrange wedges on the sheet, spaced apart. Brush tops with cream and sprinkle turbinado sugar.
Bake 17–20 minutes until golden and set. Cool on the pan 10 minutes before serving.