PF Chang's Lettuce Wraps

1 tablespoon olive oil 1 pound ground chicken 2 cloves garlic, minced 1 onion, diced ¼ cup hoisin sauce 2 tablespoons soy sauce 1 tablespoon rice wine vinegar 1 tablespoon freshly grated ginger 1 tablespoon Sriracha, optional 1 (8-ounce) can whole water chestnuts, drained and diced 2 green onions, thinly sliced Kosher salt and freshly ground black pepper, to taste 1 head butter lettuce

Heat olive oil in a large cast iron skillet over medium high heat. Add ground chicken and cook until browned, about 3-5 minutes, making sure to crumble the chicken as it cooks; drain excess fat. Stir in garlic, onion, hoisin sauce, soy sauce, rice wine vinegar, ginger and Sriracha until onions have become translucent, about 1-2 minutes. Stir in chestnuts and green onions until tender, about 1-2 minutes; season with salt and pepper, to taste. To serve, spoon several tablespoons of the chicken mixture into the center of a lettuce leaf, taco-style.