1 tsp lemon juice
1 onion, peeled
few sprigs thyme
2 bay leaves
salt and cracked black pepper
4 cloves
freshly grated nutmeg
100驳/3陆辞锄 butter
100ml/3陆fl oz double cream
700ml/1录 pint full-fat milk
6 croissants (leftover slightly stale croissants work well)