Preheat the oven to three hundred and fifty degrees.
Line a baking sheet with parchment paper.
In a small bowl, combine one-half cup of white sugar and two tablespoons of lemon zest.
In a separate bowl, using an electric mixer, combine three quarter cups of milk, one-quarter cup of lemon juice, and one-half teaspoon of vanilla, and set aside.
In a large mixing bowl, blend three cups of Bisquick and one-half teaspoon of baking soda.
Pour the lemon and sugar mix into the Bisquick and mix on medium speed until well combined. Cut in the cubed cold butter with a pastry cutter.
Using a mixing spoon, pour in the milk mixture and stir gently until combined, being careful not to over mix.
Place the dough on a lightly Bisquick floured surface and gently knead.
Roll the dough into the shape of a rectangle. Cut into six equal size squares.
Slice each square into two triangles, and place each one onto the parchment lined baking sheet.
Brush the dough with some additional milk. This will help to brown the scones during the baking process.
Bake for approximately twenty minutes and prepare the drizzle.
In a medium size mixing bowl, combine one cup of powdered sugar, one and a half tablespoons of lemon juice and one tablespoon of lemon zest. Mix until well combined.
Drizzle over each completely cooled scone and enjoy!