Kentumere refers to fish and spinach in tomato sauce, a dish from Ghana which is made with kippered herring, chopped fresh spinach, chopped onions, tomatoes, cayenne pepper and palm oil. To cook Kentumere: Heat the oil in a large skillet or heavy pot, then saute onions and pepper together. Mash or grind the tomatoes and stir them in, along with the remaining ingredients. Cook at a moderate temperature for 15 minutes, or until fish is tender and flaky. If there is too much oil on the surface for your liking, skim some off with a spoon. Kentumere is served with cooked plaintain or rice.