Slow cooker pork casserole

Cosy up on cold nights with our comforting slow cooker pork casserole. Chopped apples would make a great addition - add them in the final hour of cooking

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1tbsp vegetable or rapeseed oil 4 pork shoulder steaks (about 750g), cut into large chunks 1 onion, chopped 1 leek, chopped 1 carrot, chopped Bundle of woody herbs (bouquet garni) - we used 2 bay leaves, 3 sage leaves and 4 thyme sprigs, plus a few thyme leaves to serve 1 chicken stock cube 2tsp Dijon mustard 1tbsp cider vinegar 2tsp cornflour 1tbsp honey