225g/8oz carrots, peeled and roughly chopped
225g/8oz leeks, trimmed and sliced into 1cm/½in slices
225g/8oz onions, roughly chopped
225g/8oz potatoes, peeled and roughly chopped
225g/8oz swede, peeled and roughly chopped
1kg/2lb 3oz neck of lamb (on the bone), preferably Welsh, cut into serving pieces
2 litres/3 pints 10½fl oz lamb stock