Prepare Kasha the usual way: I just toast it, then steam it-add 1 cup kasha to 2 cups boiling water or vegetable broth and simmer about 7 minutes.
While that's cooking, sauté onion and garlic in olive oil or olive oil spray, add mushrooms and cook till done, then add spinach and stir a minute or two until wilted. Add a splash of wine, balsamic vinaigrette or Italian dressing and heat through.
Combine the two, and enjoy!
I called it mixed metaphor because the spinach part is kind of Italian and the kasha is Eastern European