Heat olive oil in a large pot over medium heat. Add diced onion and sauté until translucent.
Add the chopped potatoes and carrots to the pot. Pour in 750 ml (3 cups) of vegetable broth and bring to a boil. Reduce heat and simmer until vegetables are tender.
Stir in the chopped pickled cucumbers, dill, salt, and black pepper. Simmer for another 5-10 minutes.
In a small bowl, whisk together 100 ml (⅓ cup) of vegetable broth, sour cream, and flour until smooth.
Gradually add the sour cream mixture to the soup, stirring constantly.
Add 2-3 tbsp of juice from the pickled cucumbers and adjust seasoning if needed.
Simmer for an additional 5 minutes, then serve hot. Enjoy your flavorful, gut healing soup!