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

In a large bowl, whisk together flour, sugar, baking powder, and salt.

Using a pastry cutter or your fingertips, cut the cold butter into the flour mixture until it resembles coarse crumbs.

Stir in the lemon zest and poppyseeds.

In a separate bowl, whisk together the heavy cream, egg, vanilla extract, and lemon juice.

Pour the wet ingredients into the dry ingredients and gently mix until just combined. Be careful not to overmix!

Turn the dough out onto a lightly floured surface and pat it into a circle about 1 inch thick.

Cut the circle into 8 wedges and transfer them to the prepared baking sheet.

Brush the tops with a little extra cream and sprinkle with coarse sugar if desired.

Bake for 18-22 minutes, or until golden brown.