"It’s just creamy enough...."
INGREDIENTS
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1 large stalk celery
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1/2 small red onion or 1 large shallot
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6 sprigs fresh dill
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2 tablespoons nonpareil capers (drained), 1 medium dill pickle, or 2 tablespoons sweet pickle relish
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1 medium lemon
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1/4 cup mayonnaise, plus more as needed
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2 (5-ounce) cans oil- or water-packed tuna
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Kosher salt
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Freshly ground black pepper