Remove core from lettuce* and first outer layer of leaves. Cut head of lettuce in half and slice each half into thin strips. Dice the thin strips and add diced lettuce to a large serving bowl.
Dice radishes, celery, bell pepper, scallions, cucumber and tomatoes. Toss into diced lettuce.
Drizzle a couple of tablespoons onto the salad and toss well. Do not drench the salad, just add enough to flavor it. You can serve additional dressing on the side.
Notes
*To easily remove the core, hold head of lettuce in your hand with the core facing downward. Firmly bang the head of lettuce onto the counter so that the core is what hits. Lift head of lettuce, turn it over and simply pull the loosened core out and discard.