This is traditionally a vegetarian dish, but I needed to use up some leftover pork shoulder. You can use any cut of pork you wish, of course. I like to start this dish off with my favorite sofrito (Recipe #444676), but if you don't want to use that just start with a finely chopped onion. We like to puree the tomatoes in the food processor, but this is not necessary or traditional. I drain the liquid and puree the solids, then recombine. I like the sweet onion flavor for this recipe.