What Is A Cornichon? If You&Rsquo;Re At All A Fan Of Pickles, We Can Only Hope You&Rsquo;Ve Discovered The Cornichon. These Minuscule Sour French Pickles Are: 1. Adorable; 2. Absolutely Delicious; And 3. Very Useful. Cornichons Are Made With Mini Gherkin Cucumbers, One To Two Inches In Length And Harvested Before Reaching Full Maturity For An Extra-Tart Bite. When Choosing A Crunchy, Acidic Bite To Balance Out Cheese, PÂTÉ Or Cured Meats, You Can&Rsquo;T Lose With These &Mdash; Anything With Ham And GruyÈRe Welcomes Cornichons With Open Arms. Spear One On A Toothpick For The Perfect Slider Garnish. Chopped Finely, They&Rsquo;Re A Key Component To Authentic Steak Tartare And Make A Spectacular Tartar Sauce For Fried Seafood.