The Mexican hamburger is a Denver original — not a regular hamburger with Mexican toppings, but a burrito stuffed with a burger patty, refried beans and cheese. A blanket of green chile is also a must, and La Fiesta gets it right on all counts. A char-grilled beef patty lends the unmistakable essence of a hamburger, while the house green chile — a neighborhood favorite since the early 1960s — adds warmth without the three-alarm fire. Everything about this Curtis Park eatery feels frozen in time, but the Mexican hamburger is a timeless classic that still holds up.