Like any BBQ meat called "burnt ends," pork belly burnt ends are not actually burnt. Rather, they're deeply caramelized for a crisp, sweet exterior and a tender, savory interior.
Usually, these nuggets are made of diced pork belly slowly cooked in a smoker, but an oven works as well. The belly must be cooked low and slow to render its plentiful fat.
Cut your slab of pork belly into one-inch cubes, toss with a dry rub of your choice (like kosher salt, freshly-ground black pepper, and paprika), and place in an aluminum pan.
Instead of using a smoker, simply roast the meat in an oven preheated to 275 degrees Fahrenheit for three hours, spritzing the chunks with apple cider vinegar once per hour.
For smokiness, you can add a little liquid smoke along with the spice rub, or use smoked paprika. It's important not to overdo liquid smoke — a little goes a long way.