Instant Pot Spaghetti and Meatballs

Name: Instant Pot Spaghetti and Meatballs
Ingredients: 2 ounces Parmesan cheese, grated (about 1/2 cup), plus more for serving; 1 large egg; 1 pound lean ground beef; 1/3 cup plain breadcrumbs; 1/3 cup whole milk; 1 teaspoon Italian seasoning; 3/4 teaspoon kosher salt; 4 cloves garlic; 1 large shallot; 2 tablespoons olive oil; 1 (28-ounce) can crushed tomatoes; 1 tablespoon unsalted butter; 1 teaspoon kosher salt; 1 teaspoon red wine vinegar; 12 ounces dried spaghetti; 2 cups low-sodium beef broth