Blend together vinegar, onion, cranberry sauce, all but 1 T of the olive oil, sugar, dijon mustard, and 1/4 t each salt and pepper.
Mix 1 T olive oil with tuna, apple, and salt and pepper to taste.
Pan-sear baby zucchini in halves, adding salt and pepper to taste.
Thinly slice raw radishes - leave roasted radishes in bite-size chunks.
Tear lettuce by hand and toss all ingredients except tuna. Top with generous amount of tuna mixture.