1. Heat up a small frying pan and toast sesame seeds in a dry pan (no oil) for 3-5 minutes until brown and fragrant. Set aside to cool.
2. Bring water to boil in a saucepan and then drop chicken in. Simmer for 10 minutes or until cooked through, then remove chicken to a chopping board and reserve cooking water. Roughly chop chicken into small pieces and leave to cool.
3. Make up dressing by mixing 3 tablespoons reserved chicken stock, Bertolli Light in Taste Olive Oil, oyster sauce, soy sauce and sesame oil in a cup.
4. In a serving bowl mix the chicken, celery and lettuce and then add the dressing and sesame seeds. Mix thoroughly to combine and then serve immediately.