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["Gently wash the mushrooms under running water with a mushroom brush--making sure to remove any soft spots in the caps.", "Dry gently and let stand for about 5 minutes to finish drying in the air.", "Thinly slice the mushrooms, slicing a thin piece off of one side of the cap to provide a flat spot, then thinly slice the entire mushroom so that you have a ""T"" shape through the body of the mushroom.", "Heat the oil and butter or margarine in a large, nonstick skillet over medium heat.", "Add the sliced mushrooms to the skillet, swirl or lightly toss to coat with the butter/oil mixture.", "Thinly slice the red onion and add to the skillet.", "Turn the heat up to medium high and saute for about 5 minutes or until the liquid in the skillet has mostly evaporated.", "The mushrooms will give up their liquid rather quickly but it still takes a couple of minutes for it to evaporate.", "Stir and/or toss several times during the cooking process.", "Add salt and pepper to taste.", "Remove from the heat and serve with a slotted spoon as a side dish OR spoon the mushroom/onion mixture over mashed potatoes (or into baked potatoes)with their juices.", "Works great over steaks, pork, chicken and lamb."]