Preheat the oven to 450F degrees.
Melt 2 Tbsp of butter in the microwave then brush the melted butter onto a baking sheet.
Blend flour, baking powder, baking soda, salt and sugar in a large mixing bowl.
Use a pastry blender to cut the 4 Tbsp of cold butter pieces into the dry mixture. Mix until pea-sized lumps form.
Slowly add buttermilk while tossing mixture with a fork.
Add just enough buttermilk to make soft dough that holds together for a few seconds. Then measure out an additional Â½ Tbsp of buttermilk and add to the dough. Blend well.
Flour your hands and knead the dough 6 times in the bowl or on a floured surface. Do not over-work the dough or it will result in tough, chewy biscuits.
Flour a flat surface and pat out the dough in the flour to form a rectangle about 1/2 inch thick.
Cut out the biscuits with a round cutter and place them on the buttered baking sheet.
Bake 10 minutes or until a nice golden brown.
Melt the rest of the stick of butter and brush the tops of the biscuits after removing them from the oven.