Adapted from Tastes Better From Scratch
Cut the chicken into small pieces and sprinkle with salt and pepper.
Make the sauce by mixing all the ingredients together.
Heat the sesame oil in a large pan and add the chicken. Cook until it's done (duh)
Add the sauce to the chicken and cook at a medium heat, stirring, until the sauce thickens. Stir in the cashews.
Spoon chicken mixture into lettuce leaves. Add chopped scallions to top, plus sriracha sauce if you like.