Eggplant.

It would have to be something we don't even consider food for that to be the case. I have yet to encounter such an ingredient.

On an unrelated note, I would find it amusing if korstybai sat on my face with her diaper off.

Pickles, mustard, cilantro

I don't know if it's that flavor but I hate marjoram

Relish. Or onions like Ed Hunter said. Though I don't find them as nasty as I used to, and caramelized they're fine.

Cucumber - repulsive, stinking stuff.

Raisins.... even if fully diluted and without any residual grains or particles. It's the scent and taste ... arrrgh!

I dont think there's an Ingredient that Ruins a recipe. Just ingredients that I personally don't like.

Old bay seasoning … sorry, I hate it

pickles

Meat

Anger

Ain't no such thing as a single ingredient that ruins everything

Sugar tbh. Alittle is good too much is nauseating

Onion