1. Clean the lentils, removing any stones or other legumes. Rinse them well, soak them in water for 30 minutes, then drain and place them in a pot. Add the water and boil for 10 minutes.
2. Add the stock cubes and rice, then stir. Lower the heat and simmer for another 20 minutes until the lentils and rice are tender.
3. Meanwhile, in a small frying pan, add the olive oil and sauté the onions for 15 - 20 minutes until nicely browned (these will give a wonderful aroma to the dish).
4. Once the lentils and rice are tender, add the fried onions, lemon juice (adjust to your taste), salt, and pepper.
5. Simmer for 1 - 2 minutes, stirring the dish carefully to prevent it from becoming mushy. Turn off the heat and serve with black olives and radish.
