1Shred your chicken or cut it into little chunks. Slice the celery and red onion, peel and dice the cucumber.
2Place the chicken, celery, cucumber and red onion in a bowl.
In a small bowl stir together the vinegar, salt and pepper. Pour over the chicken and veggie mixture and stir to coat the chicken and veggies.
3Divide the salad mix in half, and place on two plates.
Divide the chicken and veggie mixture in half and place on top of lettuce.