"The trick here is to start the potato cake on top of the stove to heat it quickly, and then transfer it to the oven where it will develop a crunchy crust...."
INGREDIENTS
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1 1/2 pounds (about 2) baking potatoes, peeled and cut into 1/2-inch chunks
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3 tablespoons butter
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2 tablespoons vegetable oil
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3 scallions, including green parts, thinly sliced (about 1/2 cup)
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Salt and pepper