INGREDIENTS
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1/2 cup rice-wine vinegar
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1 tablespoon sugar
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2 teaspoons kosher salt
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1 red onion , peeled, halved and thinly sliced
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3 Persian cucumbers , peeled if skin is thick and waxy, sliced about 1/4-inch thick
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2 spring onions , thinly sliced
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2 limes , juiced, about 1/4 cup
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5 to 7 ounces olive-oil-packed tuna
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1 avocado , peeled and cubed
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1/2 teaspoon or more finishing salt , such as Maldon
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Freshly ground black pepper , to taste
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Handful basil leaves , washed and torn
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Handful cilantro sprigs , washed and torn
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Handful fresh mint leaves , washed and torn
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3 tablespoons extra-virgin olive oil