400g/14oz chestnut mushrooms
2 garlic cloves, crushed
1 unwaxed lemon, finely grated zest and juice
4 banana shallots, finely chopped
small handful fresh tarragon, leaves picked, roughly chopped, plus extra for garnish
1 tbsp Dijon mustard
100ml/3陆fl oz chicken stock
300g/10陆oz fettucine or tagliatelle
1 tbsp olive oil
150驳/5陆辞锄 cr猫me fra卯che
6 skinless, boneless chicken thighs, cut into 3cm/1in pieces
100驳/3陆辞锄 pancetta or bacon lardons