Melt the butter in a saucepan over MED-HIGH heat. Add the mushrooms and garlic. Sauté it for 8–10 minutes, until the mushrooms are cooked and most of the water has cooked off.
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1
Sprinkle in the flour and stir as you slowly pour in the beef stock.
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2
3
Stir the gravy constantly while you bring it to a boil over MEDIUM heat, then turn down the heat and let it simmer until it thickens, 10–15 minutes.
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