It's inevitable that every delicious jar of peanut butter will at some point come to an end. We've all found ourselves wondering what to do with that final spoonful—not quite enough for a PB&J ...

Each peanut butter jar was wrapped in paper to conceal the name of the brand. We also tasted each at room temperature. No pairings like celery or bread: our testers wanted to focus on each peanut ...