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Filling: Preheat oven to 375 ranges. Heat an enormous skillet over medium-high. Swirl in oil. Add lamb; season with 1 teaspoon salt and prepare dinner dinner, breaking up into bite-size gadgets and stirring typically, until browned in areas and easily cooked by way of, 7 to 9 minutes. Change to a bowl.
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Take away all nevertheless 1 tablespoon fat from skillet; return to medium heat. Add onion and carrots; season with 1 teaspoon salt. Prepare dinner dinner, stirring typically, until greens are softened and golden in areas, 6 to eight minutes. Stir in tomato paste; prepare dinner dinner 30 seconds. Stir in flour; prepare dinner dinner 1 minute. Return lamb and amassed juices to skillet. Stir in Worcestershire, broth, and 1/4 teaspoon pepper. Ship to a boil, scraping up browned bits from bottom of skillet. Reduce heat to medium-low; simmer until thickened barely, 1 to 2 minutes. Take away from heat. Stir in peas and parsley. Change to a 2-quart baking dish.
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Mash: In an enormous pot, cowl potatoes with 1 inch of water; add 1 tablespoon salt. Ship to a boil, then cut back heat to medium and simmer until tender, 12 to fifteen minutes; drain. Return pot to medium heat; swirl in oil. Add cabbage and 1/2 teaspoon salt. Prepare dinner dinner, stirring typically, until collapsed and tender, 7 to 9 minutes. Return potatoes to pot; mash with a potato masher. Add milk and butter, mashing and stirring until mixture is creamy and cabbage is distributed evenly. Season with salt and pepper. Unfold mash evenly over lamb mixture; brush prime with butter. Place on a rimmed baking sheet lined with parchment.
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Bake until golden brown in areas and effervescent alongside edges, 30 to 35 minutes. Let stand 10 minutes sooner than serving. Pie could also be refrigerated in an airtight container as a lot as 2 days.
Prepare dinner dinner’s Notes
For a creamier mash, press cooked potatoes by way of a ricer into the pot with cabbage sooner than together with milk and butter.
Variations
Typical shepherd’s pie is made with lamb, nevertheless you possibly can even substitute flooring beef or use a mix of lamb and beef.