Pre-heat the oven to 350°F.
Place a casserole dish over a medium heat and add half the butter.
Once the butter has melted, sear the chicken pieces skin side down until lightly browned and season with sea salt and freshly ground black pepper. Remove from the casserole dish and set aside.
Add the rest of the butter to the dish and continue to sear the rest of the vegetables, excluding the potatoes, until lightly browned. Then return the seared chicken to the pot and add the baby potatoes.
Pour in the white wine and simmer for 5 minutes, allowing the alcohol to evaporate. Adding the wine is optional but does give a beautiful flavour.
Whisk together the chicken stock, lemon (zest and juice), mustard and honey. Pour into the chicken casserole. Slice up the leftover lemon, and add to the dish.
Lastly stir in the herbs and cover. Transfer the casserole to the pre-heated oven for 1.5 hours