Add all the ingredients except for the lamb in a food processor or blender and process till smooth. Set aside.
Prep the lamb
Pat dry the leg of lamb and prick with a fork all over so as to get the marinade to soak in. Slather with the marinade and place inside the slow cooker.
Cook for at least 5 hours till the lamb is cooked through with internal temperature of 145 degrees Fahrenheit.
Shred the lamb with fork and serve with your grain or vegetables of choice.
Notes
If you want to dry out the water completely from the lamb, you will have to finish it off on stove top on high heat.