Preheat your smoker to 250°F.
Remove pork belly from package and pat dry with paper towels .
Cut pork belly into 1-1.5 inch cubes and place into disposable aluminum pans and coat pieces with mustard and toss to coat evenly.
Sprinkle spice blend over all sides of the pork belly cubes.
Place the cubes onto fish and vegetable mats or in disposable aluminum trays in the smoker.
Smoke until the internal temperature of the cubes is 150°F. Remove cubes from smoker, put them into 2 pans (if on fish and vegetable mats), add your favorite BBQ Sauce, and stir to coat evenly. Add some more spice rub and drizzle honey on top.
Cube up a stick of butter and distribute into both pans. Cover tightly with aluminum foil.
Remove aluminum foil, stir the cubes up to recoat evenly, and smoke for an additional 15 minutes to set the sauce.
Place pans back into the smoker at 275°F and smoke for another 30 minutes.