Preheat the oven to 450 degrees.

Mix the beef, sausage, onions, garlic, thyme, parsley, egg, Parmesan, breadcrumbs, ricotta and salt in a bowl together with your hands (like mixing play dough). Form 1 1/2-inch inch balls out of the meat mixture. Heat a large ovenproof skillet (preferably cast iron) with a bit of olive oil. Add the meatballs and brown on all sides, about 3 minutes. Place the skillet in the oven to finish cooking, 5 to 7 minutes.

Remove and toss with the red sauce. Place on the toasted slider buns and sprinkle with Parmesan and parsley.

This recipe was provided by professional chefs and has been scaled down from a bulk recipe provided by a restaurant. The Food Network Kitchens chefs have not tested this recipe, in the proportions indicated, and therefore, we cannot make any representation as to the results.