Hamburgers

My husband is in charge of the barbecue in our house and this was his quest to make the perfect hamburger meat. He wanted to make the meat taste so delicious that it wouldn't even be necessary to add other toppings. And he pretty much succeeded (although I would never forgo lettuce, tomato, or sauteed mushrooms).

3 lb hamburger
1 lb bacon (cut into small pieces)
1 large onion, chopped
2 small peppers; one red and one green
4 cloves minced garlic
1/2 cup shredded pepper jack cheese
salt and pepper to taste (probably about 1 tbsp each)
1/2 cup barbecue sauce
1-2 Tbsp cornstarch (to help the meat stay together)