This 7-UP Mayo jello salad was recreated byemmymadeinjapan tutorialon YouTube and its a vintage, retro dessert.
This retro dessert includes 7-UP soda, crushed pineapples, lime jello, andmaraschino cherries.
I think mayo in a dessert sounds awful, but I wouldnt know unless I tried it myself.

Image by emmymadeinjapan via YouTube
However, I think the other ingredients might balance out to a sweet dessert.
Plus, it would be a cool dessert to make for the holidays since its unusual and different.
I didnt know this salad was a thing, but I love the vibrant green color.

Bring it up to a boil on medium heat, and keep stirring until everything is completely dissolved.
Add one packet of lime jello, and mix until well incorporated.
Add the chopped cream cheese, and stir until a smooth consistency.

Continue to watchemmymadeinjapan tutorialon YouTube for full instructions and details.
Overall, I think its a unique dessert that sounds weird.
However, it looks super cool, and festive for the holidays.