Trim away the small pointy end of the untrimmed rack of pork spare ribs.
Then, trim away the curved long end so that you have a nice rectangular rack of ribs in front of you.
Remove the membrane from the back each rack of spare ribs using a knife to get it started in one corner, then grabbing on with a paper towel and pulling towards the opposite corner.
2 Full Racks of Untrimmed Pork Spare Ribs
Apply a thin layer of yellow mustard to the front and backs of each rack of spare ribs and rub to coat entirely.
2 tablespoon Yellow Mustard
Use your favorite BBQ rub or mix the In a Pinch Rub ingredients listed above together in a bowl or shaker.
1 cup Dark Brown Sugar, ½ cup Paprika, 2 tablespoon Course Ground Black Pepper, 2 tablespoon Kosher Salt, 2 tablespoon Chili Powder, 1 tablespoon Granulated Garlic, 1 tablespoon Onion Powder, 2 teaspoon Cayenne Powder
Apply a generous amount of rub to the fronts and backs of each slab of pork spare ribs. Its OK to leave some rub leftover to apply more throughout the cook if needed.
Let the rub set on the ribs at room temperature for about 20-30 minutes before putting them on the Traeger. You can also optionally then wrap the spare ribs in plastic wrap and place in the refrigerator for a longer period if needed or if you want to prepare ahead the night before.
While the rub is setting, mix the apple juice and apple cider vinegar together well in a spray bottle.
½ cup Apple Juice, ¼ cup Apple Cider Vinegar