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Boil potatoes in salted water until tender, about 12 minutes. Drain potatoes and pour them into a bowl.
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Combine sour cream, egg yolk and cream.
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Add the cream mixture into potatoes and mash until potatoes are almost smooth.
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While potatoes boil, preheat a large skillet over medium high heat.
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Add oil to hot pan with beef. Season with salt and pepper. Brown for 3-4 minutes.
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Add carrot and onions and continue cooking for 5 more minutes, stirring frequently.
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In a second small skillet over medium heat cook butter and flour together for 2 minutes.
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Whisk in broth and Worcestershire sauce. Thicken gravy 1 minutes. Add gravy to meat and vegetables.
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Stir in Peas.
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Preheat broiler to high.
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Fill a small rectangular casserole with meat and vegetable mixture. Spoon potatoes over meat eveninly. Top potatoes with paprika and broil 6-8 inches from heat until evenly browned.
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Serve.