Sous Vide Shredded Pork with Barbecue Sauce and Pickled Red Onion

Ingredients

• 1 (4-pound) bone-in pork shoulder, trimmed of large pieces of fat
• Salt and freshly ground black pepper
• 4 cloves garlic, peeled and left whole, plus 1 clove minced
• 1 teaspoon dried thyme
• 1 bay leaf
• 1/2 teaspoon celery salt, divided
• 1 cup ketchup
• 1/4 cup finely chopped red onion, plus 1/2 red onion, thinly sliced
• 1/4 cup freshly squeezed orange juice
• 3 tablespoons apple cider vinegar, divided
• 2 tablespoons molasses
• 1 tablespoon tomato paste
• 1 tablespoon freshly squeezed lemon juice
• 1 teaspoon Worcestershire sauce
• 1 teaspoon liquid smoke
• 1 teaspoon yellow mustard
• 1 1/2 teaspoons raw (turbinado) sugar
• 1 1/2 tablespoons boiling water
• 4 dinner rolls, for serving