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1
Sprinkle gelatin over water in a small saucepan and let stand 1 minute to soften. Cook over low heat, stirring, until gelatin is dissolved, 1 to 2 minutes. Remove from heat and whisk in 1 tablespoon passion-fruit nectar at a time until gelatin mixture is cool, then whisk in remaining nectar.
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2
Transfer to a metal bowl and set bowl into a larger bowl half-filled with ice and cold water. Let stand, stirring occasionally, until gelee is consistency of raw egg white, 15 to 25 minutes.
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3
Put egg carton in a shallow baking pan and arrange glasses in carton, then tilt glasses to a 45-degree angle. Divide gelee among glasses. Carefully transfer pan with glasses to refrigerator and chill until gelee is set, at least 1 hour.
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4
Pulse basil, sugar, and a pinch of salt in a food processor until finely chopped, then transfer to a bowl and add cream, stirring just until sugar is dissolved.
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5
Sprinkle gelatin over water in a small saucepan and let stand 1 minute to soften. Cook over low heat, stirring, until gelatin is dissolved, 1 to 2 minutes. Remove from heat and whisk in 1 tablespoon basil cream at a time until gelatin mixture is cool, then whisk in remaining cream. Pour through a fine-mesh sieve into a metal bowl, pressing hard on solids and then discarding them.
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6
Set bowl in a larger bowl half-filled with ice and cold water and let stand, stirring occasionally, until cream is consistency of raw egg white, 15 to 25 minutes.
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7
Holding 1 glass of gelee at a 45-degree angle, slowly fill glass with basil cream, gradually righting glass as filled. Fill remaining glasses in same manner. Chill, covered, until set, at least 1 hour.