Preheat oven to 425F.

Scrub potatoes clean and dry thoroughly with kitchen towel. Use a mandoline to thinly slice into discs approximately 1/8-inch thick.

Brush the inside of a cold, non-stick skillet with a teaspoon of extra virgin olive oil. Place a potato slice in the centre of the pan followed by a ring of potato slices around it (see above image for visual guide). Complete the ring by tucking the last slice underneath the first. Repeat this process until you have filled the bottom of the pan. Drizzle the first layer of potatoes with a teaspoon of extra virgin olive oil and scatter a few thyme leaves overtop.

Arrange a second layer of potatoes and drizzle with another teaspoon of extra virgin olive oil and scattering of thyme leaves. **Note: only the first layer should be as close to a perfect spirals as possible. The remaining layers should just be flat and even. Repeat the process until you run out of potatoes or fill the pan.

Place the skillet on a stovetop and turn the heat to medium. Cover the potatoes with a cartouche (a circular piece of parchment paper cut to the shape of the pan). Top with a small plate or pan and weigh down the potatoes with something heavy, such as a granite mortar or utensil-filled crock.

cook the potatoes for approximately 10 minutes, undisturbed, or until they develop a golden brown crust on the bottom layer. Remove the weight and cartouche and scatter bits of ghee or butter overtop. Place the cartouche back over the potatoes to prevent burning the top layer and transfer the pan into the oven. Bake for 35-40 minutes or until potatoes are fork tender.

To serve: place a large serving platter upside down against the top of the pan and carefully flip the pan and the platter together to invert the potatoes. Season the top with flakey sea salt and serve.