1. To make the meatballs, in a medium bowl, mix the pork, breadcrumbs, milk, eggs, allspice or spice mixture, 3/4 teaspoon of salt, fennel, garlic, a few turns of black pepper, and the chopped chili, if using.
2. If planning to bake the meatballs, preheat the oven to 375ºF (190ºC) and line a baking sheet with parchment paper. Shape the meat mixture into meatballs, roughly the size of an unshelled walnut, and place them on the baking sheet. Bake the meatballs until cooked through, about 12 minutes.
(If you want to pay fry them, heat some oil in a large skillet and fry them until cooked through. You may need to work in batches, depending on the size of your pan.)
3. While the meatballs are cooking, make the glaze by pureeing the cranberry sauce in a blender or food processor. Pour it into a large, wide saucepan or Dutch oven. Stir in the vinegar, orange juice, brown sugar, mustard, ginger, sriracha, 1/2 teaspoon salt, and some freshly ground black pepper. Heat the mixture, stirring, until it comes together. Add the warm meatballs and cook, stirring to glaze them in the sauce.