I generally do mine this way. Cover it with water in a large pot and bring to a boil. Skim off any of the junk that rises to the top and then add the pickling spice, either from the packet or from a container of it (which is what I do). Bring it down to a simmer and let it go for a couple of hours. Usually 2 to 2 1/2 hours will do. Then move it to a baking sheet. I generally line mine with foil. Heat your oven to 400. Some people add a glaze or something to it, which I've done and it's excellent that way. A mustard based one would be the way to go. Then roast it in the oven for about 30-40 minutes or so.