1.Take butter and grease your iron skillet or baking dish.
2.Make certain to preheat your oven 450 degrees if you're using an iron skillet or metal baking dish. If you're using a glass baking dish, preheat to 400 degrees.
3.Start by combining the sugar and 2 cups of the flour into a large mixing bowl.
4.Next, take and stir in the buttermilk. And if it's too dry, add more buttermilk.
5.Wash off your blackberries and dry them and then gently fold them in.
6.Once done, take and put the dough out onto a floured surface. Knead the dough several to make it into a ball. Add more flour if it's sticky.
7.Next, go ahead and roll the dough out with a floured rolling pin. It should be about 1-inch thick.
8.Using a cookie cutter, cut out the biscuits.
9.Place them on the iron skillet or baking dish, with the edges touching.
10.Put them in the oven on the center rack for approximately 15 minutes or until the tops are golden brown.
11.Once they are done, take and brush the tops of biscuits with melted butter.