Created by QueenBea on April 2, 2015
Step 1: Melt the butter in a sauce pan and add the mushrooms and garlic, cook until mushrooms start to soften and sweat, about 5 minutes.
Step 2: Whisk together the beef stock, corn starch and mustard and pour into the sauce pan.
Step 3: Toss in bay leaf and bring to a boil; reduce heat and simmer until thickened.
Step 4: Remove bay leaf and serve.