Combine beef, bread crumbs, milk, egg and salt and pepper in a bowl.
Using your hand, gently mix to combine being careful to not over mix. Form into 1 - 1.5 inch balls.
Heat the grill to 350-375 degrees over direct heat. Grill until the center reaches 135 degrees, or about 7-10 minutes. Gauge by temperature, not time for these.
Once the burger portion comes off of the grill, start layering the kebabs with toppings of your choice and serve.
Don't Over Mix: Always make sure you never over mix the meat mixture as it will make it hard and dry. Use gentle hands and not punch it like you would dough. Cook to Temperature: Look for 135 degrees internal temperature for these to be done. Storage: These store great in the refrigerator for up to three days. Meal Prep: These are fantastic to meal prep for your next cookout. Make the balls up and have them ready to simply put on the hot grill. Prep the toppings as well. This will make this a less than 10 minutes meal once the coals are hot.