Place a good knob of butter in the slow cooker along with the garlic, let that melt.
Trim fat of the shanks and seal them in a hot frying pan.
Rub the marroccan spice over the shanks then add to the slow cooker.
Pour the jar of butter sauce over the shanks and 1/4 of the jar of water.
Add the diced red onion and chopped spring onion. Some salt and pepper. Cut Rosemary stalk into 3-4 pieces and place on top of each shank.
Cook on high for first hour and then on low for another 4-5hrs, I added carrots 3hrs before serving.
Serve on a bed of your favorite mash, cauliflower and the carrots. Yum enjoy.