They mirror the herbaceousness of the Italian dressing while also coaxing the savory flavor out of the tuna. To top things off, complete the salad with chopped Kalamata olives and sundried tomatoes.

Using a pastry brush, coat each tuna ... olive oil over the vegetables. Season the watercress in a small bowl with salt and pepper, and toss with just enough vinaigrette to coat the salad.

Pour the tuna and olive oil from the can into a small bowl. Add the peppers, olives, parsley, pine nuts, onions or shallots, ...