Preheat oven to 425F degrees
In a bowl, mix together the lemon zest, heavy cream and, juice from half a lemon. Set aside
In a separate bowl, add the flour, baking powder, sugar, salt and stir until well combined
Add the cold butter cubes to the flour mix, and press the butter into the flour until it looks like coarse sand. (Make sure the butter stays cold and does not melt). Set aside
Add the egg and lemon extract to the heavy cream mixture, and mix until well combined.
Combine the wet and dry ingredients until just combined. Do not over mix
Pour the mix unto a floured surface, then press the mix together
Next fold the dough onto itself, then press down again. You want to do this 2-3 more times until the dough comes together (Note: you do not want to knead the dough)
Roll out the dough evenly to your desired thickness. I ususlly like it about an inch thick
Cut out the scones using a cookie cutter
Place the scones on a parchment lined baking sheet and chill in the fridge for 15-30mins
Bring them out of the fridge, and brush the tops lightly with some milk
Bake in the oven for approximately 12 minutes