Spicy Italian Meatball Sandwiches recipes

Name: Spicy Italian Meatball Sandwiches recipes
Ingredients: 1 1/2 pounds ground meat (we used equal parts ground beef, bison, and pork); 1 large egg; 3/4 cup whole milk; 1 cup freshly made breadcrumbs; 1/4 cup fresh chopped parsley; 1 tablespoon fresh chopped oregano; 1 medium onion, finely chopped (about 1 1/4 cups chopped); 2 garlic cloves, finely chopped; 1 teaspoon whole fennel seed; 3/4 teaspoon kosher salt; 1/2 teaspoon freshly ground black pepper; 2 jars DeLallo® Pomodoro Fresco Spicy Arrabbiata Sauce; 2 long crusty baguette; 2 8-ounce balls fresh mozzarella, sliced; baby arugula