R.J Grunts is bringing back a fan favorite for the month of May for National Burger Month. The La Fiesta Burger is made with pepperjack and cotija cheeses, pickled red onion and jalapeños, chipotle mayo, lettuce, beefsteak tomato and cilantro and on a toasted bun. The burger is topped with a whole grilled jalapeño and is served with cottage fries and a pickle spear. It is available for dine-in or carryout. The La Fiesta Burger is $18.95, plus tax.