Heat the oil in medium pot.
Add diced onion and sauté until golden.
Add 6-8 cups of water.
Add condiments: salt, pepper, dry parsley, veggie mix.
Add sliced carrots, diced celery root, red bell pepper and peas.
Let it boil until all veggies are tender. (about half an hour)
Add chopped tomatoes, sliced garlic and celery leaves.
Let it boil for another 5 minutes.
Make the soup a little bit more acidic by adding apple cider vinegar or pickle juice, to taste.
Serve with fresh parsley on top.