Sometimes you need some good old judgement-free comfort food to get through the winter day. Or a gloomy day. Or a Tuesday. These meatballs are so much fun to make but you have to be willing to get your hands messy! Beef and sausage are combined for the meat and fresh mozzarella is rolled into the center for gooey cheesy goodness. Cook these up and store them in the freezer or gather round your friends for a dinner party!