Potato Pavé with Rosemary is a unique and incredibly delicious potato recipe that will totally wow your guests!
Preheat the oven to 350°F.
Line an approximately 11-inch loaf pan with parchment paper. (It should be at least 3-inches deep.) Use a wide enough piece of parchment, so that it will cover and rise a few inches above the sides of the pan. Use scissors to cut a diagonal slit in each corner, so that the paper lies flat in all areas. Set aside.
Cut about ½-inch off each side and each end of the potatoes, to form a rectangle. Use a peeler to trim off any skin that might remain.
Slice the rectangular potatoes as thinly as possible. The best way to do this is with a mandolin. Add the slices to the buttermilk mixture as you go, being sure to separate them so they all become well coated.
Add the coated potato slices to form two even layers in the bottom of the prepared pan. Season with a bit of salt and pepper and drizzle with about 1 tablespoon of the melted butter. Continue layering potatoes with a bit of salt and pepper and melted butter after every two layers of potato slices until pan is filled.
Fold the sides of parchment paper over potatoes, directly on top of them. If there isn't enough excess to cover them, add an additional piece on top. Then cover the pan tightly with foil. Bake in the preheated 350°F oven until the potatoes are completely tender, about 1 hour and 15 minutes. You can test with fork or the tip of a sharp knife for tenderness.
After you remove the pan from the oven, cut a piece of cardboard slightly smaller than the size of pan, wrap it with foil, and place it directly on top of the parchment-covered potatoes. Then weigh it down with heavy cans -- as many as you can fit snugly on the surface. (Cans of beans, tomatoes, etc. are perfect -- the heavier, the better.) Let the potatoes cool to room temperature this way, about 1 hour. Then place them (with cans and all), in the refrigerator for at least 4 hours and ideally overnight.
Use an offset spatula between the parchment and pan to gently release the potatoes. Use the parchment paper overhang, to carefully lift it out of the pan and onto a cutting board.
Cut the loaf of potatoes into about 12 equal slices.
Coat the bottom of a large sauté pan with olive oil and place it over medium-high heat. When it's hot, add a few of the Potato Pavé slices to the pan. (If the pan doesn't sizzle when you add them, it's not hot enough -- wait until it is so it browns nicely!)
Sauté until bottom is golden brown, after about 3 minutes, carefully turn and brown the other side.