1.Coat the fennel with olive oil and salt. Sear in a hot pan until golden brown on both sides (this happens quickly).
2.Deglaze the pan with the white wine and stock - cover and leave to cook for 10 minutes or until tender.
3.In a separate pan fry the chorizo and chickpeas until caramelized. Finish with a splash of vinegar, lemon, chives, salt, and pepper.
4.When the fennel is tender add the butter, a splash of vinegar and mustard to the braising liquid - mix until combined. Baste the fennel with the sauce as it thickens.
5.Add a splash of water and extra seasoning to stretch the sauce out before finishing.