1. Heat oven to 375 degrees F. In a large bowl combine ground meat, onion, garlic, egg, mustard, breadcrumbs and salt. Form into 20 1 1/2-inch balls and place on large rimmed baking sheet. Bake until cooked through, 20 - 25 minutes. Transfer meatballs to a saucepan with barbecue sauce to keep warm.
2. Fill rolls with cheddar and heat in oven until melted, about 5 minutes. Top with meatballs and sauce, French-fried onions and pickles.