Add the chicken pulled into shreds, 2 tablespoons herbs of your choice and finish with the 6 tablespoons French dressing (vinaigrette). Mix well and it's ready.
Remarks
If you don't have a red onion, use a normal one (just half) or a shallot. If you have the time, the tomatoes are always better peeled.
As always for a salad, the quantities are for guidance only, so you can adapt them to suit your taste.