Whataburger announced the results of an online survey conducted in honor of National Hamburger Month. The Southern burger icon, with more than 700 locations in 10 states, asked its Facebook fans to name their favorite way to order a Whataburger.

The winning combination? According to the nearly 20,000 fans of Whataburger's Facebook page who participated in the survey, a Whataburger burger is best when ordered with mustard, cheese, bacon, and jalapenos, served on the chain's unique Texas Toast.

When asked to name their favorite side item to go with their burger, an overwhelming 70.4 percent chose french fries over onion rings or a side salad, all of which are available as part of the chain's Whatameal.

"Offering burgers served on our Texas Toast is something unique to Whataburger and very popular with our customers; so it isn't surprising that this is a fan favorite," says Pam Cox, group director of communications, Whataburger Restaurants. "It is also interesting to note that our original Whataburger comes standard with mustard, so these results are a true reflection of our customers' preferences."

The classic Whataburger is 100 percent fresh American beef, mustard, lettuce, tomatoes, pickles, and onions on a 5-inch bun. However, with all the different options available, there are nearly 40,000 different ways a customer can order a Whataburger. On average, the burger chain custom-makes more than 150 million Whataburgers a year and uses nearly 350,000 gallons of mustard. Nationally, Americans consume approximately 14 billion burgers over the course of each year, according to NPR.

In all, nearly 20,000 of Whataburger's more than 200,000 Facebook fans took part in the National Hamburger Month survey, conducted on Facebook from May 2 through May 9. Whataburger launched its official Facebook page in early April 2011.