In a blender, add all the ingredients for the marinade. Blend until smooth.
Score the outside fat cap of the leg of lamb, then add to a food safe bin and pour the marinade over top.
Place in the fridge for at least 4 hours but ideally overnight.
Next day, pull your lamb out of the marinade and discard excess marinade.
Place the leg of lamb onto the rotisserie spike and secure. Set aside until ready to use.
Preheat a two-zone indirect medium-high heat fire (around 350-375 degrees F). Make so that the rotisserie cooks on the cool side of the grill or pit.
Add your leg of lamb onto the rotisserie and cook until it reaches an internal temperature of 130-135 degrees F (around 2.5-3.5 hours). Make sure to maintain consistent heat, and spritz with water as needed to cool any burning spots.
Once the lamb has hit temperature, pull off and let rest for 20-25 minutes.
In a bowl, mix together all the ingredients for the OTFC Chimichurri and let sit for 10 minutes to marinate.
Slice up your leg of lamb, top with the chimichurri and enjoy!