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Preheat oven to 400°F. Place baking rack to the middle-low position. Line a large baking sheet with parchment paper. Set aside.
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In a large bowl, whisk the flour, sugar, baking powder, salt, and lemon zest. Grate the frozen butter (I use a cheese grater). Toss the grated butter into the flour mixture and combine it with a fork, pastry cutter, or your fingers until the mixture resembles coarse meal. Set aside.
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In a small bowl, whisk the cream, egg, and vanilla together. Drizzle it over the flour mixture and then toss the mixture together with a rubber spatula until everything appears moistened. Slowly and gently fold in the raspberries.
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Try not to overwork the dough at any point. Dough will be a little wet. Work the dough into a ball with floured hands and then transfer to a floured surface. Press the dough into a neat 8″ round disc and cut into 8 equal wedges with a sharp knife. Place scones at least 2 inches apart on the prepared baking sheet.
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Bake for 20-25 minutes or until lightly golden and cooked through. Remove from the oven and allow to cool for a few minutes.
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To make the glaze, simply whisk the confectioners' sugar and 2 Tablespoons lemon juice together until smooth. Add another Tablespoon of lemon juice to thin out, if necessary. Brush glaze over the tops of all scones just removed from the oven.
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Optional: Pipe some of the glaze over the scones and sprinkle with sugar crystals.