Drain and rinse one can of cannellini beans. Place the beans in a bowl along with onion, oregano, 1 tablespoon of olive oil, 1 tablespoon of red wine vinegar and a pinch of salt and pepper. Stir and set aside to marinate for about 5 minutes.
Wash two cups of baby arugula and add to a bowl along with 1 tablespoon of olive oil, 1 tablespoon of fresh lemon juice and a pinch of salt and pepper. Toss. Set aside.
Slice tomatoes and set aside. Open and drain one can of tuna fish and set aside.
To assemble wraps, spread one tablespoon of pesto (homemade or store bought) onto a tortilla. Top with ¼ of a can of tuna, ⅓ - ½ cup of arugula greens, 2 tablespoons of tomatoes and 3-4 tablespoons of marinated cannellini beans. Wrap the tortilla up tightly, tucking in the sides of the tortilla as you go. Slice the wrap in half and enjoy!