In a good-sized pot, bring lentils to a boil with water. Reduce heat, and simmer for 25 minutes. Add bulgur and seasonings. Simmer for another 5 minutes or until water is absorbed and lentils are tender. Remove from heat, add onion, and stir (or let sit) until cool enough to handle. Mix with egg and nutritional yeast; then add flour a little bit at a time, mixing to distribute flour evently. Use just enough flour to enable mixture to be made into patties. (Theyll be a little sticky.) Wet hands, and form into patties, about 1/2 thick. Fry in lightly oiled skillet over medium heat for a few minutes on each side.
Serve!