You can never really get all the creamy mayo out of a mayonnaise jar. No matter how much you scrape, there’s always a tantalizing amount still clutching to the crevices, the crannies, the nooks, mocking you with its inaccessibility. Which got Chef John thinking. He likes to use a little bit of mayonnaise to help emulsify and add creaminess to his vinaigrettes anyway. Why not shake up a batch of vinaigrette in an “empty” mayo jar? There’s no waste! Watch the video, then get the recipe for Chef John's Empty Mayo Jar Dressing. It’s pure genius.