- 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.