Salisbury Steak with Mushroom Gravy

I have really cut back on the meat we eat, and try to cook vegetarian at least 2 nights a week.  I found this recipe before I started doing that, and it was really good.  So I'll share it here.

This is basically a hamburger patty with a delicious rich mushroom gravy.  The red wine vinegar adds a nice depth of flavor to the finishing sauce.

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