INGREDIENTS
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1 tbsp unsalted butter
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1 onion, thinly sliced
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2-1/4 cups beef broth, divided
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1 tbsp grapeseed oil
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1 lb lean ground beef
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1 tbsp steak seasoning
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3 tbsp worchestire sauce, divided
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1 tsp dried onion flakes
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1 tsp dried parsley
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1/2 cup plain breadcrumbs
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1 egg
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3 tbsp cornstarch
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1/8 tsp black pepper