Step 1

In a skillet, heat up both oils over medium heat. Add chicken and cook until done.

Step 2

Add chopped onion and minced garlic and cook for 4 to 5 minutes or until the onion is almost translucent.

Step 3

In a small mixing bowl or measuring cup, whisk together hoisin sauce, soy sauce, sesame oil, vinegar, ginger and sweet chili sauce. Pour mixture over chicken and stir well.

Step 4

Simmer over medium-low heat for 5 minutes.

Step 5

Add chopped water chestnuts to chicken and stir. Remove from heat.

Step 6

Place up to 1/4 cup of mixture onto each lettuce leaf. Serve immediately.