Sunny's Beef Wellington Casserole
INGREDIENTS
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1 sheet frozen puff pastry, thawed
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1 large egg
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2 tablespoons unsalted butter
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2 tablespoons olive oil
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3 pounds ground chuck (80% beef/20% fat)
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Kosher salt and freshly ground black pepper
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4 tablespoons unsalted butter
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1/4 cup olive oil
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2 pounds baby bella mushrooms, sliced
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6 cloves garlic, minced or grated on a rasp grater
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2 bunches fresh thyme, leaves stripped and chopped
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1 large red onion, finely chopped
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Kosher salt and freshly ground black pepper
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2 tablespoons unsalted butter
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2 tablespoons all-purpose flour
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1/4 cup grainy Dijon mustard
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3 cups beef stock
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Kosher salt and freshly ground black pepper
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1/2 cup chopped fresh parsley
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