Cornichons are made with mini gherkin cucumbers (roughly 1 to 2 inches in length) that are harvested before reaching full maturity for an extra-tart bite. Fan of pickles? Then you’re going to fall in love with these! Cornichons are made with mini gherkin cucumbers (roughly 1 to 2 inches in length) that are harvested before reaching full maturity for an extra-tart bite. Miniscule as they are, they’re second-to-none when it comes to bringing a bit of tang to any dish-instantly tying together the meal or the platter. Simply put … There’s no losing when you add cornichons to the pantry. All your favorite recipes will welcome cornichons with open arms. Give it a try; you’ll see it’s true.