Beef goulash

Name: Beef goulash
Ingredients: 4 tbsp olive oil; 700g stewing steak, cut into chunks; 30g plain flour; 1 large onion, thinly sliced; 2 garlic cloves, finely chopped; 1 green pepper, deseeded and thinly sliced; 1 red pepper, deseeded and thinly sliced; 2 tbsp tomato purée; 2 tbsp paprika; 2 large tomatoes, diced; 75ml dry white wine; 300ml beef stock, homemade or shop-bought; 2 tbsp flat-leaf parsley leaves; 150ml soured cream