Mix together the ingredients for the dressing.
Drain tuna
Place tuna in medium sized bowl and lightly break apart any large chunks of tuna using a fork.
Add the celery, onions, kalamata olives, parmesan cheese and parsley and toss.
Fold in the dressing so all of the ingredients are lightly and evenly coated.
Season with salt and pepper to taste.
Serve chilled to make a sandwich or a wrap or scoop a mound on top of lettuce leaves.
Put one lettuce leaf and 2 tomato slices on a slice of bread or toast.
Place ½ cup of salad on top of the tomato slices.
Put second piece of bread or toast on top of the tomato slices and cut the sandwich in half.
