Twice-Cooked Potato-and-Leek Casserole

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Prep: 45 mins | Total Time: 1 hr 20 mins | Servings: 8

Ingredients:
  • 2 lb sweet potatoes (about 5 small), peeled and cut into 1/2-inch pieces
  • 2 lb russet potatoes (about 7 small), peeled and cut into 1/2-inch pieces
  • Coarse salt and freshly ground pepper
  • ¾ cup whole milk, warmed
  • ¾ cup heavy cream, warmed
  • 1 ½ sticks unsalted butter, melted
  • 2 Tbsp all-purpose flour
  • Pinch of cayenne pepper
  • 1 leek, white and light-green parts only, cut into 1/4-inch rounds, washed well, and dried (about 2 cups)
  • Safflower oil, for frying
Directions:
  1. Preheat oven to 425 degrees. Cover sweet potatoes and russet potatoes each with 1 inch water in 2 separate medium saucepans. Bring to a boil, salt generously, and boil until fork-tender, about 8 minutes. Drain and return potatoes to respective pans.
  2. In a bowl, combine milk, cream, and butter. Divide milk mixture between saucepans. Mash potatoes until smooth; season with salt and pepper.
  3. Spread mashed sweet potatoes evenly in the bottom of a shallow 2-quart baking dish. Top with mashed russet potatoes; spread evenly to edges. Bake until golden, about 25 minutes.
  4. Meanwhile, in a bowl, combine flour and cayenne. Add leeks; toss to coat. In a medium saucepan, heat 2 inches oil over medium-high heat until a thermometer registers 350 degrees. Working in batches, add leeks and cook, turning, until crisp and light golden around edges, about 1 minute. With a slotted spoon, transfer to paper towels to drain. Season with salt.
  5. Sprinkle fried leeks over potatoes; serve.
Source: Martha Stewart Living

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