Combine chicken, egg white, water, and salt in a medium bowl and mix well. Marinate for at least 20 minutes and up to 24 hours. Meanwhile, prepare the sauce.
Coconut Sauce
In a small bowl, combine coconut milk, sugar, mayonnaise, vinegar, cornstarch, salt, and two tablespoons of water.
Heat one teaspoon of oil in a skillet over medium heat. Add ginger and saute for 45 seconds. Add the sauce mixture and heat it until it bubbles. Set aside.
Frying
Put cornstarch in a large bowl. Give the chicken a quick mix to redistribute the marinade, then individually coat each piece in the starch.
Heat about 1 inch of oil 350℉. Fry the chicken pieces in two batches until golden brown, about four minutes*. Transfer to a wire rack to drain excess oil.
Serving
Reheat the coconut sauce over medium heat. Add the chicken pieces and toss until all the pieces are coated. Serve immediately and enjoy!
Notes
*Use an instant-read thermometer to check the temperature of the chicken. It's cooked when it reaches 165℉.Storage: Store leftovers in an air-tight container in the refrigerator for up to 3 days.