"The best beef tenderloin recipe for the perfect sandwich. Whether accompanied by a mustard horseradish or blue cheese sauce, this is a winner...."
INGREDIENTS
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1 3-4 lb beef tenderloin
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3 Tbsp Dijon mustard
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2 Tbsp unsalted butter
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1 Tbsp salt
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1 1/2 tsp kosher salt
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1 cup parsley (chopped, optional)
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fresh arugula (washed and dried)