4 cloves garlic, peeled and smashed
1/4 cup (5 or 6) sun-dried tomatoes in oil, drained
1/3 cup fresh basil leaves, packed
1/3 cup shredded mozzarella
1/4 cup grated Parmesan
1 tablespoon tomato paste
1/2 teaspoon crushed red pepper flakes
1 1/2 teaspoons kosher salt
1/2 teaspoon freshly ground black pepper
2 1/2 pounds ground sirloin beef
8 sourdough rolls, halved lengthwise
2 tablespoons extra-virgin olive oil
Topping suggestions: shredded cheese, fresh mozzarella cheese, fresh basil leaves, sliced tomatoes, marinara sauce, prosciutto, sliced olives, roasted red bell peppers, lettuce leaves, arugula, ketchup, pesto