I've made it many times, usually for kasha varnishkes.It comes in 3 size grains, fine, medium, and
large - I prefer the medium. (I use Wolff's brand).
First toast the kasha in a large, dry (preferably nonstick) skillet over medium for a few minutes, or until fragrant, stirring often. Some people coat it with an egg or egg white, which supposedly keeps the grains separated - I don't bother.
Boil water in a saucepan with salt added (or part water and part broth) - I do about 2 3/4 cups water to 1 1/2 cups medium kasha. Add kasha to water, lower heat, cover, and simmer about 7-10 minutes, or until water is absorbed and kasha is tender.
I always saute lots of onion and garlic, and add it to the kasha when done.