Step 1

Heat the oil in a large pan over medium high heat. Add the chicken and season with salt and pepper to taste.

Step 2

Cook the chicken for 5-6 minutes, breaking up the meat with a spatula, until mostly cooked through.

Step 3

Add the mushrooms and onion to the pan. Cook for 4-5 minutes or until vegetables are soft.

Step 4

Stir in the water chestnuts, garlic and ginger. Cook for 1 more minute.

Step 5

In a small bowl, whisk together the hoisin sauce, soy sauce, rice vinegar and sesame oil.

Step 6

Pour the sauce over the ground chicken mixture and toss to coat evenly.

Step 7

Sprinkle the green onions over the chicken mixture.

Step 8

Spoon the chicken into the lettuce leaves and serve.