2 carrots, peeled, sliced
2 leeks, trimmed, chopped
1 onion, peeled, chopped
1 swede, peeled, chopped
1.5 litres/2陆 pints beef stock
salt and freshly ground black pepper
2-3 tbsp olive oil
1.2kg/2陆lb stewing beef, chopped
2 marrow bones (ask your butcher for these)
crusty bread, to serve (optional)