Dice an onion, sliced small yellow potatoes, carrots, garlic and throw them into a dutch oven.
For the liquid base, I used an entire container of beef broth, tomato paste and 2 bottles of Guinness beer. Mix all the ingredient together.
Season the lamb heavily with salt and pepper and place it onto a wire rack on top of the filled dutch oven.
Set up the grill for indirect heat at 250degrees. Slowly smoke the meat for 2 hours or until the meat has a nice bark and smoke ring visible.
Remove the wire rack from the grill, place the lamb roast into the broth and continue to cook for another hour. Just before serving, shred the lamb and mix in with the broth.