Preparation

1. Dissolve lemon gelatin in ¾ cup boiling water.
2. In a measuring cup, combine 1 cup rum with enough ice to make 1¼ cups total.
3. Stir into gelatin until slightly thickened, removing any unmelted ice.
4. Fill shot glasses ⅓ full with the lemon mixture.
5. Refrigerate until set, about 90 minutes.
6. Repeat the process with orange gelatin and the remaining 1 cup rum + ice.
7. Pour over the set lemon layer.
8. Chill until firm, about 90 minutes.
9. Dissolve unflavored gelatin in 2 Tbsp warm water.
10. Stir in sweetened condensed milk and ½ cup rum. Pour over the orange layer.
11. Refrigerate until fully set, at least 30 minutes before serving.