3-4 garlic cloves, cut into slivers
1 large bunch mint leaves, finely chopped
4 onions, sliced thinly
6 large potatoes, peeled and sliced thinly
3 stems rosemary
500ml/18fl oz chicken stock
1 litre/1¾ pints beef stock
sea salt and freshly ground black pepper
1 pinch caster sugar
salt
75ml/3fl oz malt vinegar
25g/1oz butter, plus a little extra for the gravy
2.7kg/6lb leg of lamb
1 bottle (750ml/26fl oz) good red wine