kasha

kasha A porridge made from boiled buckwheat groats, or sometimes from other cereal groats.
2000, Faye Levy, 1,000 Jewish Recipes, page 218:

Some cooks add nuts as well, and I like the way their flavor complements that of the kasha and the browned onions.

Kristina Pankofska, a Polish exile whom Anna Petrovna paid a gold rouble a month to clean and help, arrived with a pail of hot kasha and two new eggs.