Heat a very large skillet to medium-high heat on the stove top. When hot, add canola oil and then garlic and ginger. Saute for about 30 seconds, until fragrant, and then add ground turkey and kosher salt. Cook for about 5 minutes, stirring often, until chicken is cooked through. (If there is a lot of excess liquid, spoon out excess so the turkey can cook and not boil.) Add coleslaw, water chestnuts, and green onions. Cook for about 2 minutes, until cabbage/slaw 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.
Prepare dipping sauce by combining all ingredients in a bowl and whisk to combine.
To serve take a few lettuce leaves and make an assembly line. Place turkey mixture in the leaves and serve on a platter or plates with a side of sauce.