The worst store-bought mayonnaise brand comes from a fast food chain, according to Food Republic's taste tester. Kewpie was the highest-ranking option, with Whataburger being the lowest due to its high cost per ounce. However, the reviewer noted that the mayo itself tastes good but has a strong allium-forward flavor. If you find this appealing, consider using it in other ways. The best ways to use it include creating an easy coleslaw recipe and adding hot sauce to make it more adaptable.