INGREDIENTS
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1 1/2 cups sugar
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1 3/4 cups water
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2 (14-oz) packages frozen guanabana (soursop) purée such as Goya brand, thawed (3 cups)
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1 1/2 cups fresh mango purée (from 1 1/2 lb mangoes) or 1 (14-oz) package frozen mango purée, thawed
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3 tablespoons fresh lime juice, or to taste
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1/2 teaspoon finely grated fresh lime zest
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Special equipment: an ice cream maker
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Garnish: lime zest