Garlic Toast Meatball

Name: Garlic Toast Meatball
Ingredients: Chunky Tomato Sauce; 2 teaspoons olive oil; 1 small yellow onion, chopped; 1 garlic clove, finely chopped; 1/4 cup red wine; 1 (28oz) San Marzano whole tomatoes; 3/4 teaspoon kosher salt; 1/4 teaspoon freshly ground black pepper; 2 teaspoons balsamic vinegar; 2 fresh basil leaves, torn; Meatball Patties; 1 pound lean ground beef; 1 pound ground veal; 1.5 cups Japanese panko breadcrumbs; 3/4 cup freshly grated Parmesan cheese; 2 eggs; 1 tablespoon chopped flat leaf Italian parsley; 1 teaspoon dried oregano; 1 small garlic clove, minced; 1 teaspoon kosher salt; 1/2 teaspoon freshly ground black pepper; 1/2 cup water; 16 slices Sourdough or Rye bread; 8 tablespoons garlic butter, softened; Kosher salt, to sprinkle on griddle; 8 slices provolone cheese