01 -
Whisk flour, sugar, lemon zest, baking powder, and salt together in a large bowl. Grate the frozen butter using a box grater. Add it to the flour mixture and combine with a pastry cutter, two forks, or your fingers until the mixture comes together in pea-sized crumbs. Place the bowl in the freezer.
02 -
Whisk 120ml heavy cream, the egg, and vanilla extract together in a small bowl. Remove the flour mixture from the freezer. Drizzle the cream mixture over the flour mixture, add the blueberries, then gently mix together until everything appears moistened and ingredients are just combined.
03 -
Lightly flour a work surface. Pour the dough onto the surface and, with floured hands, work dough into a ball. Dough will be sticky. If too sticky, add more flour; if too dry, add 1-2 more tablespoons heavy cream. Press into an 8-inch disc, about 1 inch thick. Using a sharp knife or bench scraper, cut the disc into 8 wedges.
04 -
In a small bowl, mix the remaining 1 tablespoon cream with 1 tablespoon water, then brush it on the scones. Optionally sprinkle with coarse sugar. Place scones on a plate or lined baking sheet and refrigerate for at least 15 minutes, or up to 24 hours.
05 -
Preheat oven to 204°C. Line a large baking sheet with parchment paper or silicone baking mat. Arrange chilled scones 2-3 inches apart. Bake for 22-25 minutes or until golden brown around the edges and lightly browned on top. Remove from the oven and let cool for 5 minutes before icing.
06 -
Whisk the confectioners' sugar and 2 tablespoons lemon juice together in a small bowl. If desired, thin out with an additional tablespoon of lemon juice. Drizzle over warm scones.