This is a summer favorite. I grew up having these...my grandparents made them and then my parents made them. My whole family loves these! You could make them in the oven but for some reason they just don't taste as good as they do on the barbecue! You don't want real lean hamburger as the dish needs some "juices" but you don't want it too greasy either. I usually use the 12-15% fat. If you go with less fat your meat patty and veggies will seem dry. If you don't like any of the ingredients like onions or celery...cook it all together and then pick those parts out. It is important to the taste for it to all cook together.