Lemony Tuna Salad

From Every Day with Rachael Ray April 2008

1/4 C mayonnaise
4 tsp lemon juice
2 tsp grated lemon peel
Salt and pepper
1 6oz can solid white tuna, drained
1 C canned white beans, rinsed
1/2 English cucumber, cut into 1/2" cubes
1/4 C finely chopped red onion
1 large head romaine lettuce, shredded
1 C cherry tomatoes, chopped

In a large bowl, whisk together the mayonnaise, lemon juice and lemon peel; season with salt and pepper. Add the tuna, breaking it apart slightly with a fork, then the beans, cucumber and onion. Season with salt and pepper.
Arrange the romaine in 4 large plates and top with the tuna salad and tomatoes.