Heat the oil in a frying pan on the heat, and sauté the onion slices until they are well browned without burning them, then drain and set them aside.
Soak the lentils and wash them well from the impurities several times, then put them in a pot with water on the heat, and when boiling, cover the pot and leave it to boil over a low heat for 20 minutes.
Drain the lentils from the water, then add the chicken broth to the filtered water from the lentils and set aside.
Drain the soaked rice, and stir it in a saucepan with the oil, and fry the onions, then add the broth, salt, black pepper, and cumin, and leave the ingredients to boil over a strong heat until you start to see bubbles in the rice, then add the lentils and do not stir the lentils with the rice.
Cover the pot and leave it to cook on a very low heat until the rice is done.
Do not remove the lid from the pot until fifteen minutes have passed after turning off the heat, then garnish with reddish onions.
Serve and enjoy your Mujadara!