Grate butter into dry ingredients and combine in 2 or 3 batches.
Add buttermilk and mix until mixture is all crumbles. Hand knead/fold until all remaining dry ingredients are combined into a single ball.
Turn out dough ball onto a floured surface and roll out into a rectangle approximately 1/2" thick. Fold thirds , rotate 1/4 turn and repeat until dough has been rolled and folded 5 - 7 times. Roll out final time 1/2" and cut biscuits.
Place on baking tray (optionally, brush top of biscuits with melted butter) and put in oven for 15 - 18 minutes until golden brown on top.