Add the flour, yeast and soy or tamari to make a paste or roux. Be careful not to let it burn. Gradually add the water, stirring constantly. With frequent stirring, bring the gravy to a boil and allow it to thicken.
Add pepper, mushrooms, wine and balsamic vinegar.
If the gravy is too thin, add a small amount of cornstarch which has been dissolved in some cold water. You can add more water to the gravy if you want a lighter gravy for certain dishes.
The flavor is very strong and can easily handle the extra liquid. It's even better if you let it sit in the fridge overnight and gently reheat it. This is great over a lentil loaf, biscuits, potatoes, just about anything you would want to smother with a rich gravy.
Makes 4 cups.