Cut all the vegetables in small cubes and set aside.
Heat up the oil in a pot and sauté the onion, carrots and celery on a medium heat.
Once the vegetables are soft, add 1.5L of water on top, and add salt to taste. Bring to boil, then reduce the heat to low.
Add the potatoes, wait for 10 minutes, and add the bell pepper and the green beans as well. Wait for another 5 minutes and add the tin of chopped tomatoes.
Meanwhile, bring the bors to the boil.
Add the bors over the soup, let it come to boil again, then turn off the heat.
Taste and add salt and pepper to your liking.
Sprinkle some dried lovage or thyme on the top.
Enjoy hot, with crusty bread and/or sour cream.