Instant Pot Cheater Pork Stew

Name: Instant Pot Cheater Pork Stew
Ingredients: 1 tablespoon extra virgin olive oil (avocado oil, or ghee); 1 large onion (thinly sliced); 6 garlic cloves (peeled and smashed); 3½ pounds pork shoulder (cut into 1½-inch cubes); 1 tablespoon Magic Mushroom Powder (or Diamond Crystal kosher salt); 1 teaspoon Red Boat fish sauce; 1 cup marinara sauce; 3 medium carrots (cut into 2-inch chunks); 1 small cabbage cut into 8 wedges (cut into 8 wedges); 1 tablespoon aged balsamic vinegar; Diamond Crystal kosher salt; Freshly ground black pepper; ¼ cup finely chopped Italian parsley (optional)