Rinse the lentils in cold water and drain. Cook in 4 1/2 cups water until soft (20 minutes)...do not add salt as this will toughen the lentil.
Fry the onions slowly in 3 - 4 tablespoons olive oil. Cook slowly until the onions are soft and caramelized. Onions will be one when they turn a golden brown.
Add half of the friend onions and the rice to the cooking lentils. Cover and cook over a low heat for another 20 minutes or until the rice and lentils are tender. Add water as necessary to make sure the rice and lentils cook and do not become too dry.
To serve place the lentils and rice in a serving dish, using the remaining olive oil. Top with the caramelized onions. Serve at room temperature.