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Ingredients

• 3 1/4 cups all-purpose flour — plus extra flour for kneading
• 0.3 cup granulated sugar
• 1 1/2 tbsp earl grey tea, ground until fine
• 2 1/2 tsp baking powder
• 1/2 tsp baking soda
• 1 tsp salt
• 3/4 cup cold unsalted butter
• 1 large egg, lightly beaten
• 3/4 cup cold buttermilk
• 1 cup fresh blackberries
• Extra buttermilk & granulated sugar to top scones before baking
• 1 cup powdered sugar
• 1 1/2 tbsp lemon juice
• 1 tsp vanilla
• 1 lemon, the Zest of