Start by peeling the yellow potatoes and cutting them into large chunks—leave the smaller ones whole, halve medium-sized ones, and quarter the larger pieces. Rinse them under cold water to remove excess starch, which helps achieve that signature crispy texture. Set aside while you prepare for the next step.

Fill a large pot with water and add a generous pinch of kosher salt. Bring the water to a boil, then add your potato chunks. Parboil them for about 10 minutes until they’re just fork-tender but not fully cooked. Drain the potatoes well, then allow them to cool to prevent browning before moving on to the roasting phase.

While the potatoes cool, preheat your oven to 425°F (220°C). In the meantime, in a roasting pan, add duck fat (or your chosen alternative) and place it in the oven to heat for about 10 minutes. You’ll know it’s ready when the fat is shimmering and almost smoking, creating the perfect environment for crispy roast potatoes.

Once the fat is hot, carefully remove the roasting pan from the oven. Add the cooled, parboiled potatoes to the pan and toss them gently to coat each piece thoroughly in the hot fat. This step is crucial as it helps to create a deliciously crispy exterior on your Crispy Roast Potatoes with Rosemary and Garlic.

Return the coated potatoes to the oven and roast them for 45 minutes to 1 hour. Halfway through, flip the potatoes to ensure even browning and crispiness. Keep an eye on them; they should develop a beautiful golden color and a crunchy texture as they roast to perfection.

During the last 10 minutes of roasting, take your whole head of garlic and chopped fresh rosemary and add them to the pan. This allows their flavors to infuse the potatoes, enhancing your Crispy Roast Potatoes with Rosemary and Garlic, and filling your kitchen with a tantalizing aroma.

Once the potatoes are golden brown and crispy, remove the pan from the oven. Sprinkle the crispy roast potatoes generously with flaky sea salt while they’re still hot, allowing the seasoning to stick. Serve immediately, enjoying the deliciously crispy exterior and fluffy interior of these irresistible potatoes!