Beef Stroganoff

Ingredients

• 20g butter
• 2 tbsp olive oil
• 5 large pine mushrooms, sliced
• 5 field mushrooms, sliced
• 1 brown onion, halved lengthways, thinly sliced
• 500g piece beef scotch fillet, trimmed, cut into thin strips
• 2 tbsp plain flour
• 2 tbsp tomato paste
• 1½ cups beef stock
• 1/3 cup light sour cream
• 2 tbsp flat-leaf parsley, roughly chopped
• 4 sheets fresh pasta, roughly torn into strips