This skillet-size hash brown was inspired by a side dish at the beloved Tornado Steakhouse in Madison, Wisconsin. Slicing potatoes lengthwise on a mandoline makes for long, dramatic-looking strands, although you can also julienne the potatoes in a food processor.
of baking potatoes, peeled and cut into medium julienne
of thinly sliced scallions, whites and light green parts only, plus sliced scallion greens for garnish
sour cream, for serving
Preheat the oven to 400°. In a colander, rinse the julienned potatoes until the water runs clear; drain well and pat very dry. In a large bowl, toss the potatoes with 2 teaspoons of salt and 1/2 teaspoon of pepper.
In a 10-inch ovenproof skillet, heat the canola oil until shimmering. Remove the pan from the heat and add half of the potatoes. Return the skillet to the heat and, using a spatula, spread the potatoes in an even layer. Scatter the 1 cup of thinly sliced scallions evenly over the potatoes, then scatter the remaining potatoes on top. Using the spatula, shape the potatoes into a neat cake.
Cook the potatoes over moderately high heat until well browned on the bottom, 9 minutes. Using a metal spatula, flip the cake, then cook over moderately high heat until lightly browned on the bottom, 5 minutes. Transfer the skillet to the oven and bake for 12 minutes, until cooked through. Slide the hash brown onto paper towels to drain. Transfer to a plate and season with salt and pepper. Garnish with sliced scallion greens and serve with sour cream.