Wash lentils and put in a large pot with 2 cups of water. Cook over high heat until boiling. Reduce the heat and continue to cook until lentils are tender, about 30 minutes.
Meanwhile, heat the oil in a medium pan and fry the chopped onion until golden.
Add the fried onion and vegetables broth to the lentils and reboil. Add the wide noodles, reduce the heat, and cook until the noodles have softened, about 15 minutes.
Season with salt and pepper as needed, and serve hot.