Boil the lentils and onion sliced in the tomato juice (having previously strained away the pulp) for one and a half hours; add one teaspoonful of salt and a quarter of pepper; strain. When cool, take a quarter of a pound of the lentils, add the remainder of the seasoning and the tomato pulp, which must have been squeezed quite dry, chop all fine, add three ounces of bread crumbs and half a beaten egg. Shape into little sausages, roll in the remainder of the egg and bread crumbs, and fry in boiling oil. Thicken the liquor which was strained off with the butter and flour, and serve separately.
Note. The remaining lentils can be used in a variety of ways.