Start by gathering all your ingredients. Ensure your butter is frozen and your heavy cream is cold. Zest the orange and set aside.
In a large mixing bowl, whisk together the flour, sugar, baking powder, salt, ground cardamom, and orange zest until well combined.
Using a pastry cutter or fork, cut the frozen butter into the dry mixture until it resembles coarse crumbs. Be careful not to overwork the dough; you want to see small pieces of butter throughout.
In another bowl, whisk together the lightly beaten eggs and cold heavy cream until combined. Pour this mixture into the dry ingredients and stir gently until just combined.
Turn the dough out onto a floured surface and knead gently just until it holds together. Pat it into a circle about 1-inch thick.
Using a cookie cutter or sharp knife, cut the dough into wedges or rounds. Place them on the prepared baking sheet, leaving space between each scone.
Brush the tops of the scones with the egg wash made from the beaten egg and water. Sprinkle a little sugar on top for a sweet crunch.
Bake in the preheated oven for 15-20 minutes, or until the scones are golden brown. Keep an eye on them to avoid overbaking.
While the scones are baking, whisk together the confectioners' sugar, ground cardamom, and fresh orange juice in a small bowl until smooth.
Once the scones are baked, remove them from the oven and let them cool slightly on a wire rack. Drizzle the glaze over the warm scones for a delicious finish.