Preheat the oven to 375°F or gas mark 5. Line the sheet pan with foil if using and place rack on top and place parchment paper on top. If using the roasting pan place a rack inside.
Combine all of the spice rub ingredients into a mixing bowl. Coat the entire pork shoulder with the spice rub and place on the rack. Roast for 20 minutes per pound or until internal temperature reaches 165°F or 74 C.
While the pork is roasting add all of the glaze ingredients to a saucepan and reduce by half. The mixture should start turning into a syrup. Pass the glaze through a strainer to remove the zest and peppers and set aside.
Once the pork has cooled long enough to handle shred, toss with the glaze and garnish.