Nibblous | beef stroganoff

Ingredients

• 675g of beef fillet, preferably cut from the tail end
• 65g unsalted butter
• 1.5 tbsp of paprika
• 1 large onion, very thinly sliced
• 350g button mushrooms, very thinly sliced
• 3 tbsp sunflower oil
• 300ml soured cream
• 2tsp lemon juice
• a small handful of finely chopped parsley
• salt and black pepper