Balsamic and Brown Sugar Short Ribs Fall Right off the Bone

Name: Balsamic and Brown Sugar Short Ribs Fall Right off the Bone
Ingredients: 2 tablespoons vegetable oil; 8 bone-in beef short ribs (about 4 1/2 pounds); 1 teaspoon black pepper , plus more to taste; 1 tablespoon kosher salt , divided, plus more to taste; 1 medium -size yellow onion , finely chopped (about 1 1/4 cups); 6 garlic cloves , thinly sliced (about 3 tablespoons); 1/3 cup balsamic vinegar; 1 teaspoon onion powder; 1/2 teaspoon garlic powder; 2 cups beef broth; 1/3 cup packed light brown sugar; 2 bay leaves; 12 small fresh cipollini onions (about 10 ounces), trimmed and peeled; 1 medium celeriac (celery root), peeled and cut into 1 1/2-inch pieces (about 2 cups); 3 carrots , peeled and cut into 1 1/2-inch pieces (about 1 1/2 cups); Finely chopped fresh flat-leaf parsley (optional)