Hello, on my opinion these are the most useless dishes / ones the people very rarely or never looks for them.
Roasted Dragon Wings (Increases your shielding skill by 10 for one hour)
Banana Chocolate Shake ("Makes you happy")
Filled Jalapeno Peppers (Increases your speed by 100 levels for one hour) - If you ever use utani hur or get paralyzed, the effect dissapears.
Northern Fishburger (Increases your fishing skill by 50 for one hour)
Coconut Shrimp Bake (Improve your underwater walking speed while wearing a helmet of the deep for 24 hours) - This one can be useful for players hunting on zones underwater.
Demonic Candy Ball (Various Effects on random chance) it has multiple effects and can activate one on chance but to be honest none of them is worth it since you never know how many Candy Balls it will take to get it and you can't use them too often.
Being these, the most useless foods from this event.