Traditional Shepherd's Pie
Ingredients:
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3 pounds Yukon Gold potatoes
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1 tablespoon kosher salt
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¼ cup milk
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3 tablespoons salted butter, divided
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1 cup shredded white Cheddar cheese
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¼ cup sour cream
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1 large egg yolk
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2 teaspoons kosher salt, divided
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1 teaspoon ground black pepper, divided
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1 tablespoon olive oil
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1 cup diced onion
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1 cup diced carrot
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1 pound ground lamb
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1 pound ground beef sirloin
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3 tablespoons all-purpose flour
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1 teaspoon finely chopped fresh rosemary
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1 teaspoon finely chopped fresh thyme
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1 cup beef stock
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1 tablespoon tomato paste
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1 tablespoon Worcestershire sauce
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1 cup frozen green peas
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1 tablespoon chopped fresh parsley, or to taste