"Don't waste your time cooking an entire tenderloin when you can cook individual pieces up faster...."
INGREDIENTS
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butter (plus more as needed)
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extra-virgin olive oil
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6 beef tenderloin, 1/2" pieces pounded to 1/4" thick
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salt & freshly cracked black pepper
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1 cup flour
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1/2 pound Cremini mushrooms, sliced
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1 yellow onion, thinly sliced
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1 tablespoon thyme leaves
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2 sheets store-bought puff pastry
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1/4 cup Dijon mustard
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1 cup red wine
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2 teaspoons Worcestershire sauce
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1/4 cup water (plus more as needed)
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1 egg (plus 1 tablespoon water, whisked)
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flaked sea salt
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rosemary sprigs, for garnish