Preheat the oven to 350 degrees.
Add the blueberries, sugar, lemon zest, and lemon juice to the dish you will use for baking. Give it a thorough stir.
In a separate bowl, mix the flour, salt, and baking powder.
Cut the butter into the flour by squeezing it through with your hands or using a pastry cutter or forks.
Stir in the buttermilk. The batter will be somewhat lumpy and very sticky.
Drop big spoonfuls of biscuit batter over the top of the blueberries, eventually covering the dish.
Bake at 350 degrees for 30-35 mintues until fragrant, bubbling, and lightly browned. If you are using frozen berries, you may need to bake it longer, 40-45 minutes.
Serve warm, optionally topped with your favorite ice cream or whipped cream.