Wendy's International Inc. announced today that it plans to offer customers who order a Spicy Chicken Sandwich the opportunity to spice it up with a slice of pepper jack cheese.

The offer is running now for a limited time at most all Wendy's locations.

The promotion is a precursor to the company's newest sandwich, "4-Alarm Spicy Chicken Sandwich" which they're planning to test-market in a few areas later this month.

The 4-Alarm Spicy Chicken Sandwich is built on the same chassis as the Spicy Chicken Sandwich, but includes the pepper jack cheese, along with sliced jalapenos, and chipotle sauce.

Wendy's is going full steam ahead with its new line of hot foul offerings after their Spicy Chicken Sandwich became one of the chain's most popular items. McDonald's tried to capture some of the success with its Spicy McChicken, but failed and eventually pulled the item off their menu. Wendy's Spicy Chicken Sandwich has become so popular that people have posted recipes online trying to duplicate the same taste.

The trend towards spicy sandwiches is getting hotter all the time, as evidenced by such new entries like Carl's Jr. new Jalapeno Burger, White Castle's Chipotle Chicken Sandwich, and Red Robin's Chili Chili Cheeseburger.