Southern Living's "perfect" buttermilk biscuits

http://youtu.be/d348FGXomg0

(it looked like this amount of dough made about 9 biscuits) 

1 stick frozen butter, grated
2 1/2 cups White Lily self-rising flour
1 cup cold buttermilk

Grate the frozen butter and gently mix into flour, using your fingers. Store mixture in freezer 10 minutes to re-chill. Make a well in middle of mixture and pour in buttermilk. Incorporate well, using approx. 15 stirs. (One commenter's family tradition is to stir with a fork "until the dough follows the fork around the bowl.") Place mixture on floured surface and sprinkle flour on top. Flour rolling pin. Roll out into rectangle, fold over and repeat four more times. On the last fold over, roll out to 1/2 inch thickness. Flour biscuit cutter each time you cut into dough, and cut straight up and down. Place biscuits on parchment-lined pan, making sure they touch. Bake @ 475 degrees for 15 minutes. Brush tops with melted butter.


Another commenter: "Make sure all your ingredients are fresh.  Flour and baking powder go bad after a while when they have been opened.  Humidity gets into it and things won't rise like they should.  Making biscuits on a rainy day you'll notice they don't rise like they should."