Thinly slice the green onion, separate the whites and greens. Set the green tops aside for garnish.
If using chicken tenders: Trim the white tendon from the chicken tenders using kitchen shears, pat chicken dry with a clean paper towel, and cut into roughly 1 inch chunks.
If using chicken tenders: Place the chicken tenders, shredded carrot, green onion whites, 1 tablespoon soy sauce, 1 tablespoon rice vinegar, sesame oil, pepper, ginger, and chili flakes into the bowl of a food processor. Pulse until chicken is in small pieces, scraping down as needed, about 10 pulses. It’s ok if a few chunks are larger.
If using ground chicken: finely chop your carrots and green onion whites with a sharp knife. Mix together ground chicken and chopped veggies until combined. Add in 2 tablespoons soy sauce, 2 tablespoons rice vinegar, sesame oil, pepper, ginger, and chili flakes into the bowl. Stir until combined.
Preheat a 12” heavy skillet or wok over medium high heat. Add olive oil and heat for one minute. Add the ground chicken/veggie mixture, broccoli, water chestnuts, onion and garlic.
Quickly distribute the mixture around the pan, then do not stir it for 2 to 3 minutes to build a sear on the chicken and broccoli.
Continue cooking, breaking the chicken into small pieces, until cooked through and no pink remains, about 8 minutes.
Add the green tops of the green onions and stir.
Optional: In a small bowl, whisk together the dipping sauce ingredients and set aside. If using sriracha, start with ¼ teaspoon, taste, and adjust as needed.
Place about ¼ cup of the cooked chicken mixture on leaves of the lettuce, top with a sprinkle of sesame seeds and some shredded cabbage. Serve immediately with dipping sauce.