Easy Southern Buttermilk Biscuits

0 Preheat the oven to 425F.
1 Lightly grease a cookie sheet or cover it with parchment/silpat.
2 Sift the flour, baking powder, and baking soda into a bowl.
3 Whisk in the sugar and salt.
4 Using the large side of a grater, grate the butter into the flour mixture stopping occasionally to fold the butter shreds into the flour.
5 Stir the butter shreds into the flour and then make a well in the center.
6 Pour the cold buttermilk into the well and mix the flour mixture into it lightly with a fork until a soft dough is formed.
7 Turn out on a floured work surface and gently knead 15 strokes.
8 Pat into a rectangle.
9 Cut into 2 equal pieces and stack one on top of the other.
10 Pat down until it's 1" thick.
11 Cut straight down with a biscuit cutter.
12 Place biscuits on the prepared baking sheet.
13 Brush the tops with a little buttermilk. Sprinkle with a little sugar if desired.
14 Bake for 15 minutes, or until golden brown and done.
15 Serve hot.