Add boiling water to a large roasting pan, add vinegar, brown sugar, lemon juice, Kitchen Bouquet and catsup, stir and mix well.
Cut spare ribs into strips and add salt and pepper to taste. Brown spare ribs in 2 tablespoons shortening. When brown, put in a roaster with catsup mixture. Peel onion and put in pan and cover. Bake at 350 degrees for 1 hour then turn meat over. Add more water to sauce if necessary. Return to oven and bake 1 more hour. To thicken sauce combine 3 tablespoons flour and 1/2 cup water and mix. Take onion out of pan and add mixture to thicken sauce 1/2 hour before end of cooking time. The sauce will thicken during the last half hour of cooking. Sauce can be served over spare ribs and mashed potatoes. Serves 6.
