A good burger in Tucson can be rare, according to Caliente readers. They also like them medium rare, well done, with different types of cheeses, on different types of bread and with a variety of toppings, including ketchup, mayo, mushrooms, lettuce, bacon and guacamole. Hundreds of Tucsonans participated in Caliente's 2013 Burger Battle by sounding off through Facebook and by email about who makes the best burgers in town. The result was a long list of top-notch burger joints located across the city.