Italian Meatballs, Tomato and Parmesan Jaffle

Name: Italian Meatballs, Tomato and Parmesan Jaffle
Prep time: 35 min
Cook time: 8 min
Total time: 43 min
Cuisine: European, Italian, Mediterranean
Ingredients: 400g beef mince; 1 teaspoon garlic salt; 1/2 teaspoon Italian mixed herbs; 2 teaspoons olive oil; 1 small onion, finely chopped; 1 clove garlic, crushed; 1 teaspoon sugar; 1 cup tomato passata; Salt and freshly ground black pepper; 2 tablespoons chopped fresh basil; Softened butter; 8 slices sourdough; 100g shaved parmesan or pecorino cheese