Stir Fry Sauce:
Make the special sauce by dissolving the sugar in water in a small bowl. Add soy sauce, rice wine vinegar, ketchup, lemon juice and sesame oil. Mix well and set aside until you're ready to serve.
Combine the hot water with the hot mustard and set this aside as well. Keep the chili paste as-is. Before serving, add your desired measurement of hot mustard and/or red chili paste to the special sauce mixture to pour over the wraps.
Prepare the stir fry sauce by mixing the soy sauce, cornstarch, brown sugar, and rice vinegar together in a small bowl.
Bring oil to high heat in a wok or large frying pan. Saute chicken breasts for 4 to 5 minutes per side or done. Remove chicken from the pan and cool.
As chicken cools, mince water chestnuts, onion and mushrooms to about the size of small peas. When chicken is cool, mince it into the same size pieces.
With the same pan on high heat, add another tablespoon of vegetable oil. Add chicken, garlic, onions, water chestnuts and mushrooms to the pan. Add the stir fry sauce to the pan and saute the mixture for a couple minutes until warmed through. Serve mixture in the lettuce "cups" and top with special sauce mixture.
by The Savvy Kitchen