Prepare the simplest, but very flavorful and delicious sauce.
Mix vegetable broth with tomato paste (or tomato ketchup 4 tbsp). Add sour cream, sunflower oil, pressed garlic clove, seasoning (I have ground coriander and cumin), pepper and salt. Whisk the sauce with a whisk. If the sauce is very sour, you can add a pinch of sugar.