"We take a beloved but dull mainstay and turn it into an exciting summer lunch...."
INGREDIENTS
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6 small red potatoes
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1 lemon, juiced, plus 1 tsp. lemon zest
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2 teaspoons dijon mustard
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1/4 cup EVOO
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2 cans (6 oz. each) tuna packed in olive oil, drained and flaked
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2 large celery ribs with leaves, thinly sliced crosswise
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1/3 cup finely chopped red onion
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Salt and pepper
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1 package (5 oz.) arugula
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4 ripe tomatoes, cored and partially cut into 6 wedges (bottom still intact)