This crisp cucumber salad combines fresh romaine lettuce, juicy cherry tomatoes, and fragrant basil. The secret to its bright flavor is a quick marinade of dry white wine and salt that lightly pickles the cucumbers and scallions before they join the greens. It makes a refreshing side dish for warm weather dinners or weekend cookouts. A simple dressing of olive oil and fresh lemon juice ties the crunchy vegetables together with a zesty finish.