1. Peel, wash, and cut the vegetables into small pieces.
2. Sauté the leek in butter for about 10 minutes.
3. In another pot, put the other vegetables and cover them with water.
Add half of the bouillon cube and cook for 30 minutes or 10 minutes in a pressure cooker.
4. Cover the leek with water and add the remaining bouillon cube. Cook for about 20 minutes.
5. Once the vegetables (carrots, turnips, tomatoes... but not the leek!) are cooked, blend them and season to taste.
6. Add the cream and the unblended leek.
7. Mix everything together and enjoy.