Step 1

Preheat oven to 350 degrees F (175 degrees C).

Step 2

Mix flour, white sugar, baking powder, baking soda, and salt in a bowl. Cut in cold butter with a pastry blender until mixture resembles coarse crumbs. Whisk milk, 3 tablespoons lemon juice, lemon zest, and vinegar in a small bowl and stir into flour mixture until moistened; turn out onto a lightly floured surface.

Step 3

Knead dough briefly for 5 or 6 turns. Pat or roll dough out into a 1 inch-thick round. Cut into 10 wedges and arrange on a baking sheet leaving 1 inch between each wedge.

Step 4

Bake in preheated oven until bottom edges are lightly tan, 11 to 14 minutes. Allow scones to cool for 15 minutes.

Step 5

While scones are cooling, stir confectioners' sugar, melted butter, 2 1/2 tablespoon lemon juice, and vanilla extract in a bowl until smooth. Stir water into sugar mixture, 1 tablespoon at a time, until mixture is easily drizzled.

Step 6

Drizzle glaze over warm scones.