Step 1

Spray 15 plastic shot glasses with vegetable oil cooking spray.

Step 2

Combine pineapple juice and sugar in a small saucepan. Add gelatin and let sit 5 minutes.

Step 3

Heat the pan over medium heat. Whisk for 2 to 3 minutes to dissolve the sugar and gelatin. Do not let mixture boil.

Step 4

Sitr in cake vodka.

Step 5

Pour half of mixture into a bowl and stir in the grenadine.

Step 6

Divide grenadine mixture between the plastic shot glasses. Place in refrigerator for 15 to 20 minutes or until it firms up.

Step 7

Place a cherry in each cup and pour the remaining pineapple mixture around it.

Step 8

Place in refrigerator until firm.