Garden Tuna Salad

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1/4 red onion, chopped

1/2 teaspoon freshly grated lemon zest

Juice of 1/2 lemon

1 teaspoon kosher salt

Freshly ground black pepper

3 tablespoons extra-virgin olive oil

4 medium radishes, thinly sliced

1 rib celery, chopped

1/2 kirby cucumber with skin, chopped

1 medium ripe tomato, diced

1/4 cup chopped fresh herbs, such as fresh flat-leaf parsley, dill, and/or basil

3 cups mesclun salad greens

1 (6-ounce) can water-packed tuna, drained