Martha and chef Francis Mallmann make a delicious Patagonian potato galette.
Using a mandoline, slice potatoes into 1/8-inch thick slices. Keep potato slices stacked on top of one another to prevent discoloring while slicing.
In a 12-inch cast-iron skillet, heat 2 tablespoons clarified butter over low heat. Working quickly, arrange potato slices in skillet in concentric circles starting with larger slices around the perimeter and working towards the center, overlapping by about 1/2-inch and angling them up the sides of the pan. Cover gap in the center with a small potato slice. Pour 2 tablespoons clarified butter around edges and over potatoes, making sure to cover the center.
Increase heat to medium-high and place another heavy skillet over potatoes to weigh them down. Cook for 15 to 20 minutes. If one side of the galette begins to brown too quickly, roatate pan or adjust heat as necessary.
Remove the weight, and, using two spatulas, turn galette. Invert galette onto a plate and season with salt; serve immediately. Repeat process with remaining potatoes and butter. If galettes are prepared in advance, transfer to a baking sheet and warm in a 350-degree oven 1 to 2 minutes before serving.