2 carrots, roughly chopped
2 sticks celery, roughly chopped
4 garlic cloves, roughly chopped
1kg/2lb 4oz white seedless grapes
2 small brown onions, thinly sliced
2 sprigs thyme
1 bay leaf
salt and freshly ground black pepper
pinch mace
2 tbsp olive oil
2kg/4lb 8oz oxtail
250g/9oz piece pancetta with rind, diced