My recent recipe for Santa Fe "Chicken" Sandwiches included an ingredient that is not familiar to everyone. I ordered this spice online from Penzey's Spices, a fantastic spice purveyor. It can be purchased in supermarkets as well.
Chipotle ground red pepper is a dried version of smoked red jalepeños. It adds a deep smoky flavor to whatever dish you use it in. The sauce on the Santa Fe Sandwiches has just the right amount of heat with only 1/4 teaspoon used. You can vary the amount of heat to suit your personal preference. The sauce is so tasty, I've made it twice again, and even used it on other types of sandwiches. Give this exciting spice a try!