Preheat the oven to 400℉ and line a baking sheet with parchment paper.
In a medium sized bowl, add the sugar and zest the lemon. Massage them together with your hands to release the oils from the lemon and evenly distribute it throughout the mixture.
½ c granulated sugar, 1 lemon
Add the flour, baking powder, and salt to the bowl and mix until well combined.
2 c all-purpose flour, 2 teaspoon baking powder, ¼ teaspoon salt
Using a grater, grate the cold butter into the flour mixture. Using your fingers or a pastry blender, cut the butter into the flour mixture until it resembles the texture of course sand. If you do not have a grater, you can alternatively cut the butter into small pieces instead.
½ c unsalted butter
Make a well in the center of the flour mixture and add the heavy cream, egg, and vanilla extract. Mix until the dough has formed together.
½ c heavy cream, 1 egg, 2 teaspoon vanilla extract
Turn the dough out onto a lightly floured surface and shape it into a ball. Pat the dough down into a disc about ½ inch thick and sprinkle the huckleberries on top (Make sure that you washed and dried the berries beforehand). Roll the dough into a log. Rotate and roll the log along the long edge so it results in a ball. Pat the dough down again into an approximately 8-inch round disc. Cut the disc into 8 wedges.
1 c huckleberries
Transfer the dough to a baking sheet lined with parchment paper and brush the tops and sides with heavy cream. Bake for 20-25 minutes or until golden brown. Allow to cool on the baking sheet for a few minutes before transferring to a cooling rack.
To make the huckleberry icing, add the powdered sugar to a small bowl. Juice the berries by either using a blender or squeezing them with your hand. Run it through a fine mesh strainer to get rid of the berry skins. Add the juice to the powdered sugar and whisk until smooth. Top the baked scones with the glaze and enjoy.
1 c powdered sugar, 2-3 tablespoon juice from huckleberries