Tuna Provencal

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1 can drained white chunk tuna

1 tablespoon capers

12 cured black olives, pitted and sliced

1/2 red onion, finely chopped

2 plum tomatoes, seeded and chopped

1 tablespoon olive oil

2 tablespoons red wine vinegar

Salt and pepper

1 bunch of watercress, rinsed and dried

6 slices whole grain bread