squeeze lemon juice
16 baby onions, peeled
25g/1oz English mustard
250ml/9fl oz white chicken stock
4-8 Cornish sardines, filleted, carcasses and heads reserved
陆 tsp mustard powder
1-2 tbsp rapeseed oil
pinch salt
1 tbsp white wine vinegar
25g/1oz butter
125驳/4陆辞锄 cr猫me fra卯che
1 free-range egg yolk, beaten
250g/9oz all-butter puff pastry, rolled to 3-4mm thick
150g/5oz piece streaky bacon
16 quails' eggs