Beef lettuce wraps

Name: Beef lettuce wraps
Ingredients: 10 ounces lean (20% fat) ground beef; 2 tablespoons grapeseed oil; ½ cup diced water chestnuts (strained of all water); ¼ cup sweet Thai chile sauce, such as Mae Ploy brand; 2 tablespoons soy sauce; 2 tablespoons kechap manis (Indonesian soy sauce); 2 tablespoons coarsely chopped mint; 2 tablespoons coarsely chopped cilantro; 2 tablespoons sliced green onions; 1 large head bibb lettuce, cleaned and leaves separated