Thaw it…first off. Put it in a large tub in a sink, then fill with cold water, let the water run over it and drain (you want a continuous flow over the meat) until it is thawed. If you want to speed up the process when it has been in for a couple hours see if you can hack it in half (cautiously). Regardless, this should take at least 6hrs. Cut into small chunks, and place on hith in the slow cooker with some stock/seasoning. 4-6hrs should be ready.