20 Conference pears, peeled, stalks intact
1 lemon, zest peeled off in large strips using a potato peeler
2 sprigs fresh rosemary
1 tbsp allspice berries
500g/1lb 2oz caster sugar
1 large cinnamon stick, broken into three pieces
陆 tsp cloves
2 tsp juniper berries
3 star anise
1 litre/1戮 pints white wine vinegar