In a pressure cooker, fry the onion with the vegetable oil until golden and soft.

Add the meat cubes, cinnamon sticks, salt, pepper and cover with 2 liters of water. Close pressure cooker. Cook for 35 min at highest pressure (achieved when steam starts escaping). Remove from heat and let pressure drop before opening the cooker cover (achieved when all steam escapes).

Add the green beans, zucchini, carrots, potatoes, and tomatoes. Close pressure cooker. Cook for 10 more minutes at high heat. Remove from heat and let pressure drop before opening cooker cover again.

Finally, add the dissolved tomato paste and the fresh parsley. Adjust salt and pepper to taste and let it simmer for an additional 5 min on low heat.

Serve hot.