This recipe for ground chicken and eggplant lettuce wraps was inspired by the menu at P.F. Changs. They have a similar chicken and eggplant dish that's one of the best things I've ever ordered at a Chinese restaurant. My recipe is pretty different from theirs, but it captures my favorite components of the original — especially the contrast of sweet, spicy, and salty flavors and the way the tender eggplant practically melts in your mouth. Adjust the amount of chili paste to suit your desired level of spiciness, or leave it out and allow each diner to add it directly to their own portion to accommodate a variety of tastes.