Some time during the summer, my slow cooker took up residence on the kitchen counter, and ever since, I've been inspired to adapt some of my favorite stove top recipes to the low-and-slow method. Kasha (buckwheat groats) reminds my taste buds of the best comfort food that came out of my Polish grandmother's kitchen, and it never fails to satisfy, whether I'm serving it as a side dish with roast chicken or brisket, or a lunch or light supper entree with a tangy green salad on the side. If you've never cooked with kasha before, look for it in the ethnic foods aisle at your grocery store; it comes in three different granulations -- fine, medium, and coarse. This kasha, kicked up a bit with caramelized onions and mushrooms, does its thing without the frequent tending the stove top version demands, down to browning the onions right in the slow cooker. You can make ahead and freeze, then reheat in the microwave.