Preheat oven to 400°F (200°C) and line a baking sheet with parchment.

Mix flour, sugar, baking powder, and salt in a large bowl. Cut in cold butter until crumbly with pea-sized bits.

Stir in milk, lemon zest, and lemon juice until dough forms. If sticky, add a little flour.

Turn onto a floured surface, knead lightly a few times, and shape into a 1-inch-thick circle. Cut into 8 wedges and place on the baking sheet.

Bake 15–20 minutes until golden and a toothpick comes out clean. Cool slightly before serving warm or at room temperature.