In Zelda: Tears of the Kingdom, Spices like Oil Jar are typically used in cooking meals. They usually boost a status effect duration or amplify the dishes healing power. Spices can't be consumed raw.
It's the natural peanut oils rising to the top. Yet some peanut butters have no oil on top. Why? Following is a transcript of the video. Does your peanut butter have a pool of oil on top?