Welsh Beef stroganoff

Ingredients

• 450g PGI Welsh Beef steak – sirloin or fillet, cut into thin strips
• Oil
• 25g butter (optional)
• 100g button mushrooms, sliced
• 1 yellow pepper, seeded and sliced into thin strips
• ½ tsp salt
• 1 tsp coarse black pepper
• 1 onion, thinly sliced
• 3 cloves garlic, crushed
• Splash of white wine or brandy (optional)
• 300ml beef stock
• 1 tbsp tomato puree
• 1 tsp paprika
• 1 tbsp Dijon mustard
• 2 heaped tbsp crème fraiche
• Chopped parsley and cooked white and wild rice to serve