1. Heat oil in a pot. Saute the onions, with a little salt, until the onions become transparent.
2. Add the tomato, carrots, and garlic. Let simmer for 2 minutes.
3. Add water (you will probably want to add more later to achieve the right ratio of liquid to solid ingredients), stock cube, rice, lentils, mint and black pepper to taste.
4. After ten minutes, add the chopped courgette and leave for a further 15 to 20 minutes to simmer.
5. Finally, turn off the heat and squeeze into the pot the juice of half a lemon (or to taste), stir and serve.