I would dip a sandwich in pickle juice.
Ever have pickle and peanut butter?
Get better pickles
It adds a perfect bit of extra crunch that lettuce tomatoes onions don't have. and the salty vinegar/dill pickle flavor is a great compliment to mayo and mustard.
or to peanut butter. it's good. I do like pickles quite a bit, hot ones, sweet ones, sandwiches or whole.