Parmentier Potatoes are small, diced potatoes that are roasted in olive oil with garlic and herbs until they are perfectly crispy on the outside and tender on the inside. Named after the Frenchman Antoine-Augustin Parmentier, who promoted the use of potatoes in European cuisine, this dish is simple to prepare yet packed with flavor, thanks to the combination of herbs and seasonings. Jamie Oliver’s version keeps the process straightforward, while still delivering a deliciously crisp and golden result.