4 garlic cloves, sliced
2 large onions, cut into quarters
750g/1lb 10oz waxy potatoes, such as Desiree, peeled and cut into thick 2cm/¾in slices
1–2 tsp redcurrant jelly
few drops Worcestershire sauce
50g/1¾oz plain flour
gravy browning (optional)
2.25kg/5lb whole shoulder of lamb, skin on
570ml/1pint hot lamb or beef stock
450ml/16fl oz hot lamb or beef stock
100ml/3½fl oz red wine