Slow cooker beef goulash

Name: Slow-cooker beef goulash
Ingredients: 3 tbsp olive oil; 2kg braising or stewing steak, cut into chunks; 2 large onions, finely chopped; 4 mixed peppers, cut into 4cm chunks; 3 garlic cloves, crushed; 2 tbsp flour; 2 tsp caraway seeds; 2 tsp hot smoked paprika; 1 tbsp sweet smoked paprika, plus extra to serve; 4 tbsp tomato purée; 4 large tomatoes cut into small chunks; 400-500ml beef stock; 300ml soured cream; small bunch of parsley, chopped