1 (3 ounce) package lemon-flavored gelatin mix (such as Jell-O®)
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1 cup vodka
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3 ice cubes, or as needed
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0.75 cup boiling water
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1 (3 ounce) package orange-flavored gelatin mix (such as Jell-O®)
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3 ice cubes, or as needed
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1 cup vodka
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2 tablespoons warm water
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1 (.25 ounce) envelope unflavored gelatin
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1 (14 ounce) can sweetened condensed milk
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0.5 cup light rum
Instructions
Make the yellow layer: Pour boiling water into a small bowl. Add lemon gelatin mix and stir until dissolved.
Pour vodka into a 2-cup liquid measure; add enough ice to make 1 1/4 cups. Pour into lemon gelatin mixture and stir until slightly thickened; remove any unmelted ice. Pour mixture into 16 tall shot glasses, filling each 1/3 full. Refrigerate until lemon gelatin is set, at least 1 1/2 hours.
When lemon gelatin is set, make the orange layer: Pour boiling water into a small bowl. Add orange gelatin mix and stir until dissolved.
Pour vodka into a 2-cup liquid measure; add enough ice to make 1 1/4 cups. Pour into orange gelatin mixture and stir until slightly thickened; remove any unmelted ice. Pour into shot glasses over lemon gelatin. Refrigerate until orange gelatin is set, at least 1 1/2 hours.
When orange gelatin is set, make the white layer: Stir warm water and unflavored gelatin together in a bowl until gelatin is dissolved. Stir in condensed milk and rum. Pour into shot glasses over orange gelatin. Refrigerate until set, at least 30 minutes.