Tuna Salad with Herb Toast

6 tablespoons mayonnaise

1/2 cup chopped fresh basil and/or chives

Kosher salt and freshly ground pepper

4 thick slices crusty bread

2 tablespoons red wine vinegar

1 head romaine lettuce, shredded

1 English cucumber, chopped

1 15-ounce can chickpeas, drained and rinsed

1 pint cherry tomatoes, halved

2 stalks celery, chopped

3 tablespoons chopped pickles or cornichons

2 5-ounce cans solid white tuna in water, drained