Start by preheating the oven to 400 degrees F.
In a medium bowl, combine flour, sugar, baking powder, baking soda, salt, and poppy seeds.
Cut butter into chunks and use a pastry cutter to combine with flour mixture until butter chunks are pea-sized.
To heavy whipping cream, add the egg, lemon extract, lemon peel, lemon juice, and lemon juice. Mix until just combined.
Turn out onto a floured surface and knead for a minute or two until dough forms. It will be a little sticky. Roll up into a ball and pat into a circle about one inch thick.
On a lightly greased baking sheet, cut the circle into eight triangles.
Bake the scones for 18-21 minutes, or until they are lightly browned on the bottoms and a toothpick comes out clean. Transfer to a cooling rack.
While the scones are cooling, prepare the glaze by mixing water, lemon juice, and lemon peel in a small bowl. Add powdered sugar slowly, mixing thoroughly after each addition.
When scones are cool, spoon glaze over them and serve.