Mojito Jelly

Line the bottom and sides of an oiled 8-inch square glass baking dish with a piece of plastic wrap, smoothing out wrinkles.

Sprinkle gelatin over 3/4 cup water in a 2-quart saucepan and let stand 1 minute to soften.

Heat mixture over low heat, stirring occasionally, until gelatin is dissolved.

Stir in rum, sugar, and mint, then simmer, stirring occasionally, 5 minutes. Remove from heat and let stand, uncovered, while mint steeps, 20 minutes.

Stir in lime juice and remaining cup water, then pour through a fine sieve into baking dish and chill, covered, until firm, at least 8 hours.

While jelly is chilling, halve limes lengthwise and scoop out all flesh, reserving it for another use. Chill lime bowls, wrapped in plastic wrap.

Place a cutting board over baking dish and invert jelly onto board. Peel off plastic wrap and cut jelly into 1/2-inch cubes. Spoon into lime bowls.