To prepare the stir fry sauce, mix the soy sauce, rice vinegar, sesame oil, sugar, Chinese hot mustard, and cornstarch in a medium bowl. Stir until the ingredients are incorporated and set aside.
In a cast iron or heavy-bottom pan, add approximately a ¼-inch of oil and heat to 350 degrees F. Test the temperature by dropping a few rice sticks into the oil – if they puff up right away, the oil is ready. Gently drop a handful of the rice sticks (pulled apart) into the oil, quickly flip them once they have puffed – it will only take seconds for them to cook. Remove the rice sticks and allow them to drain on a paper towel. Continue cooking the remaining rice sticks in this fashion.
In a large pan over medium-high heat, add a tablespoon of canola oil. Add the ground chicken and sauté until cooked through. Season with salt and pepper to taste. Remove the chicken and set aside.
Reheat the pan you used to cooked the chicken, adding another tablespoon of oil. Add the garlic, green onions, water chestnuts, and mushrooms. Sauté for approximately 3 minutes. Add the chicken and stir fry sauce. Toss to incorporate and remove from heat.
Gently pull off the leaves of the lettuce and serve with the chicken, crispy rice sticks, dipping sauce, and extra Chinese hot mustard. Enjoy!
Recipe by at https://hapanom.com/chicken-lettuce-wraps/