Heat a large sauté pan or wok, add the caraway seeds and lightly toast over the heat for a few seconds. Add the oil, then tip in the onion, mushrooms and pepper, and season well (salt will help draw the moisture from the mushrooms). Cook, stirring frequently, for about 6-8 mins until the vegetables are softened and the onion is starting to turn golden.
Stir the paprika into the vegetables, tip in the tomatoes, stock and half a can of water, and leave to cook for 5 mins. Top portions with the soured cream and parsley, if using, and serve with pasta, jacket potatoes, or garlic bread.