Using your hands, gently mix together the beef, bacon, mustard, salt, onion powder and pepper.
Form into 30 (golf ball size) meatballs.
Heat a grill or grill pan to high heat and grill 3 minutes on each side, or until your desired doneness.
Place on skewers with lettuce, pickles and tomatoes and serve with ketchup and mustard for dipping.
Notes
*The meat can be prepared up to 3 days in advance and stored wrapped in the refrigerator. Bring to room temp before grilling.Slightly adapted from Danielle Walker's Against All Grain Celebrations.