"The best tool for grating is a rotary grater by Zyliss ($20; chefcentral.com) or by Microplane ($25; thekitchenstore.com)...."
INGREDIENTS
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10 ounces peeled cooked shrimp, cut into 1/4- to 1/3-inch pieces
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2 1/2 cups thinly sliced iceberg lettuce (about 1/4 large head)
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1 1/4 cups finely grated peeled fresh coconut
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1/2 unpeeled English hothouse cucumber, seeded, cut into 1/4-inch cubes (1 cup)
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1 tablespoon plus 1/2 cup fresh lime juice
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6 teaspoons fish sauce (such as nam pla or nuoc nam),* divided
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4 1/2 teaspoons sugar, divided
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3 teaspoons minced seeded red or green serrano chiles, divided
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2 tablespoons finely chopped green onion
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2 teaspoons chopped fresh mint leaves
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15 8- to 9-inch-diameter rice paper rounds (spring roll wrappers)**