Peel the carrots and wash the zucchini, cut them into pieces. Peel the potatoes, and cut them in half. Peel and chop the onions and garlic.
Heat the oil in a casserole dish. Brown the onion and garlic, add 2 tablespoons of browning seeds and sauté for 1 minute.
Pour in the meat and stir briskly for a few minutes.
Pour the colombo over the meat, stirring constantly. Add salt and pepper and cover with water to level.
Cover and let cook for 1 1/2 hours.
40 min before the end of cooking, add the potatoes to the casserole and, 10 min later, the pieces of zucchini and, if necessary, the seeded and chopped chili pepper.
When ready to serve, pour the lemon juice into the sauce, stir and serve hot with white rice.