Tender meatballs are made from a combination of beef and pork and then served in between two halves of homemade garlic knot buns with melted mozzarella cheese.
Preheat oven to 425ºF (220ºC). Divide the dough so you have 4 balls weighing 1/2 pound each.
Lightly flour a clean cooking surface then take the first ball and divide into 5 equal portions. You should end up with 20 pieces (each weighing about 45g).
Roll each into a rope then form knots with each, tucking the ends under to make a ball. Place on a parchment paper-lined baking sheet and repeat with the remaining dough. Cover the dough balls loosely in plastic wrap and let proof for 30 minutes.
Bake until the garlic knots are golden brown, about 15 minutes.
In a small saucepan over medium-low heat add the olive oil and heat through. Add the butter and let melt. Whisk the mixture together and add the garlic and oregano and remove the pan from the heat.
Brush the garlic knots generously with the garlic butter mixture. Set aside.
For the meatballs:
Preheat the oven to 400ºF (190ºC). In a small mixing bowl combine milk and breadcrumbs and let it sit for 10 minutes.
In a large mixing bowl add the beef, pork, egg, cheese, parsley, garlic, salt, pepper and the breadcrumb mixture.
Gently mix with your hands until thoroughly combined.
Use ¼ cup measuring cup to form balls that are about 2¾ ounces each. Place onto a parchment paper lined baking sheet. Continue with the remaining mixture.
Bake the meatballs until they are cooked through and browned on the outside, about 20 minutes.
For assembly:
Heat a large sauté pan over medium heat, add the marinara sauce and heat through. Add the meatballs and toss to cover.
Preheat the oven to broil. Slice the garlic knots in half and leaving the top partly intact. Place a meatball on the bottom half of each garlic knot and top with a slice of mozzarella cheese.
Continue with the remaining garlic knots and meatballs and broil until the cheese has melted, about 1 minute. Close the sliders and serve immediately.