mary berry's steak and ale pie
- 2-3 tablespoons sunflower oil.
- 500g (1 lb 2 oz) stewing steak, cubed.
- 1 large onion, chopped.
- 2 tablespoons flour.
- 1 x 500ml (18 fl oz) bottle of local ale.
- salt and freshly ground black pepper.
- 225g (8 oz) button mushrooms, quartered.
- 280g (10 oz) all-butter puff pastry.