How to Make It
Carefully scoop out the flesh of each orange half; reserve orange flesh for another use. Place orange halves in a 12-cup muffin pan. Set aside.
Pour boiling water into a medium-size heatproof bowl. Add gelatin; stir until completely dissolved. Stir in vodka and cold water until thoroughly combined.
Gently pour mixture into orange halves, filling three-fourths full. Chill until set, 2 hours or up to 4 hours.
Remove orange halves from muffin pan. Cut each half into quarters, and serve immediately. Shoot responsibly.