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Cooking day: cut steak into serving pieces; dredge steak with flour seasoned with salt and pepper.
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Brown on both sides in butter and oil in a heavy pan.
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Remove steak from pan; add onions to pan; saute until golden.
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Stir in garlic, wine, broth, Worcestershire sauce, soy sauce, and pepper, stirring up all the browned bits from the bottom of pan.
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Return steak to pan, cover, and simmer slowly (lower the heat) for 1 1/2 hours, until meat is very tender.
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Stir in cheese until melted, then stir in sour cream; heat until sour cream is blended in, but do not boil.
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Can eat immediately or if OAMC--cool completely; place meat and sauce together in freezer bag; remove as much air as possible, and seal; take a cake pan or pan that has sides, and lay the bag flat; place the pan in the freezer; once it has been "flash frozen", remove from the pan and place inside your freezer.
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Serving day: thaw meat and sauce completely; place in a heavy pan; heat on stove over low heat until sauce and meat are heated through, but do not boil.