boneless beef sirloin (sliced into thin strips), oil and
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boneless beef sirloin (sliced into thin strips), oil, sliced fresh mushrooms, onion, sliced, garlic (or to taste), cream of mushroom soup (undiluted ), half-and-half cream (or for a thicker sauce use whipping cream), dijon mustard, salt and pepper, cooked rice or hot cooked egg noodles