Shoppers can find Mother's Gefilte Fish in the kosher foods aisle of supermarkets and small grocers from Shaw's in New England to Albertson's on the West Coast. Some stores carry the product all year, while others stock it only for the Jewish holidays of Rosh Hashanah, Hanukah and Passover.
Mother's Gefilte Fish comes in jars of liquid or jelled broth. The oval-shaped fish patties consist of various combinations of ground carp, mullet, whitefish and pike, along with eggs, onions, matzoh meal, seasonings and monosodium glutamate. The sweet-tasting fish is precooked, so diners usually eat it cold or at room temperature.