Place large pot of water on to boil for the noodles
and prepare noodles per instructions.
While waiting for the water to come to a boil, melt the butter in
a large pan. Saute the onion for a couple of minutes. Place beef in
the skillet and brown on all sides (see note above). The fondue beef
cooks quickly and takes about 5 to 10 minutes to cook.
Add the can of mushroom soup and mix with the natural juices from
the beef. Add the can of mushrooms and heat through. Drain the noodles
and return to pot. Pour beef mixture over and toss.
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