Sticky Pork and Apple Slaw

Name: Sticky Pork and Apple Slaw
Ingredients: 2 tablespoons olive oil; One 2-pound boneless pork butt; Kosher salt and freshly ground black pepper; 2 cloves garlic, minced; 1 large yellow onion, thinly sliced; 1 1/2 cups apple juice; 1/2 cup applesauce; 1/4 cup low-sodium soy sauce; 2 tablespoons light brown sugar; 2 tablespoons apple cider vinegar; 1 cup thinly sliced green cabbage; 1 cup thinly sliced red cabbage; 1/2 cup grated carrots; 4 green onions, whites and greens, thinly sliced; 2 Granny Smith apples, cored and cut into matchsticks.; 1/2 cup mayonnaise; 1/2 cup minced fresh parsley leaves; 2 tablespoons whole-grain mustard; 1 tablespoon honey; 2 teaspoons apple cider vinegar; 2 pinches kosher salt