Heat a very large skillet to medium-high heat on the stove top.  When hot, add vegetable  oil and then garlic and ginger.  Saute for about 30 seconds, until fragrant, and then add ground chicken, chopped mushrooms, and kosher salt.  Cook for about 5 minutes, stirring often, until chicken is cooked through.  (*At this point, sometimes I have some extra liquid in the pan from the chicken.  If it's quite a bit, I tilt the pan and spoon it out so the chicken can cook and not boil.) Add cabbage/coleslaw, water chestnuts, and green onions.  Cook for about 2 minutes, until cabbage starts to wilt.  Add soy sauce, sesame oil, the zest from the lemon and the lemon juice, and hot sauce to taste.  Remove from heat and stir in cilantro.

To prepare dipping sauce, combine all ingredients and whisk to combine.

To serve, carefully remove the individual leaves from the head of lettuce.  (The closer you get to the center, the easier it becomes!)  Place chicken mixture in the leaves and serve with sauce.