
<p>A friend and I discovered this recipe together and both consider it a staple menu item. I fix the moist ground beef patties often for family and friends. We love them with mashed potatoes, rice or noodles and the gravy, which gets great flavor from fresh mushrooms. —<span style="font-size: 12.8px; white-space: normal;">Phyllis Miller, Danville, Indiana</span></p>
In a large bowl, beat the egg; stir in onions, bread crumbs and mustard. Add beef and mix lightly but thoroughly. Shape into four 1/2-in.-thick patties.
In an ungreased skillet, cook patties until meat is no longer pink, 4-5 minutes on each side; drain.
In a small bowl, combine gravy, water and horseradish; add mushrooms. Pour over patties. Cook, uncovered, until mushrooms are tender and heated through, about 5 minutes. If desired, sprinkle with parsley.