Meatball Subs | culture: the word on cheese

Ingredients

• 4 tablespoons extra-virgin olive oil (divided)
• 3 cloves garlic (finely chopped)
• 1 onion (finely chopped)
• 1 pound 85 percent lean ground beef
• 1 pound 80 percent lean ground pork
• 3 large eggs (lightly beaten)
• 1 ½ cups plain bread crumbs
• ½ cup whole milk
• ⅓ cup grated parmesan cheese
• 1 teaspoon dried oregano
• 1 teaspoon kosher salt
• ½ teaspoon freshly ground black pepper
• ¼ teaspoon red pepper flakes
• 6 cups marinara sauce
• 8 to 10 ciabatta rolls (for serving)
• 16 to 20 slices provolone cheese (for serving)