I made rice flour! It was soooo easy, and took about 5 minutes. You can find the recipe on Maangchi's site www.maangchi.com. For the 잣죽 (Jatjuk - pine nut porridge) I will be making, you simply soak the rice for a few hours, rinse it, drain it, then grind it. My Nutribullet has proven it's worth 10x over with salad dressings, smoothies, soups, and now: rice flour! Yay!
...can't get enough Korean Food!!! :-))