Add the beef, onion, red peppers, garlic, paprika, caraway seeds (if using), chopped tomatoes, tomato puree, and beef stock to the slow cooker. Stir to combine.
Cover and cook on low for 6–8 hours or high for 4–5 hours until the beef is tender.
Garnish with parsley and serve with rice, mashed potatoes, or crusty bread.