Every kitchen needs a good set of knives, and every set of knives needs a good knife sharpener. Knives are the key to skillful cooking, but they're only any good if you can keep their edges smart.
A knife sharpener is a must-have for your kitchen if you don't want to end up turning your tomatoes into a pile of pulp rather than sleek slices. We tested popular manual and electric knife sharpeners ...