Cornichons are about the size of your pinky finger, about an inch and half in length and less than a quarter inch in diameter. They're nubby and bumpy, tart and crunchy. The French call them cornichons, and they're sold under the same name in the US, but the English call them gherkins. These delicious little pickles are great on an appetizer plate, chopped up in deviled eggs, and added to sandwiches.
Cornichons come from a few types of small-growing gherkin plants that are picked when quite young because as they grow more, the pimply nubbins become sharp spikes. Although they are similar to cucumbers, they are not true cucumbers. It's probably pretty difficult to find this particular type of small cucumber in markets in the US, but if you want to grow your own, these varieties are commonly used in France:
If you'd like to try your hand at making your own cornichons, here is a recipe.
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(Image: Kathryn Hill)