Season lamb shanks with salt & pepper.
Preheat slow cooker in browning mode set to sear.
Add some oil, add shanks & brown on all sides. Remove shanks.
Add the garlic, onion, carrot, celery & leeks cook till onion is just soft.
Add the rest of the ingredients bring to the boil add lamb shanks and any juices. Stir well & put lid on. Cook on low for 6-7 hrs.
Add spinach before serving.
If you want to thicken remove shanks, add spinach & set slow cooker on browning mode (sear).
Mix 1 tsp of cornflour with a little water add to the gravy, mix well and let it boil for about 1 min.
Serve on a bed of mash potatoes.
Garnish with chopped chillis or some garlic chives.
If using dry herbs halve the amount in the recipe.
This can be frozen
I used the Sunbeam secretchef slow cooker.