Arrange empty shot cups on rimmed baking sheet; Set aside.
Add packet of red Jello and 1 cup boiling water to a medium mixing bowl; stir until the gelatin dissolves. Add the cold water and stir to combine.
Using the injector, fill 15 shot cups ¼ full with the mixture. Transfer the tray of Jello shots to the fridge for an hour, or until gelatin sets.
Add the orange juice to a medium mixing bowl and sprinkle the unflavored gelatin over the top of it. You may need to gently press down on the gelatin powder to get it wet and start the process. Leave the mixture to sit until the gelatin dissolves and no longer looks clumpy.
Add in ½ cup boiling water and stir until the gelatin dissolves. Add the tequila and stir to combine.
Using the injector, fill the shot cups with tequila mixture to about ¾ of the way full. Transfer the tray of shots to the fridge for 1 ½ hours, or until set.
Top with whipped cream and a cherry for serving, if desired, and enjoy responsibly!
Store in refrigerator without garnishes, with lids on, for up to 1 week. Do not freeze.
Notes
Nutrition shown is for 1 Jello shot, without whipped cream or cherries.
Do not add hot water to the unflavored gelatin powder before it’s been dissolved in cold water. You’ll make it clumpy and stringy. It’s salvageable, but definitely not as easy to use or as nice looking.
If you want to make the red layer alcoholic, swap out half a cup of the cold water for more tequila. Do not go beyond half a cup of alcohol per Jello layer or you risk the layer not setting up.
I like using Sunny D for the orange juice as its sweet flavor rounds out the flavor of the shot well. Avoid using an orange juice that has pulp. The texture and appearance are unpleasant in a shot.
I like using an injector because it’s quicker and easier. However, I’ve been able to use a pourable measuring cup and make it out with little mess as well.
Add garnishes right before serving or within a couple hours of serving. Garnishes have a tendency to get gross sitting in the fridge for long periods.