Red Wine Sauce with Mustard (Vegetarian)

Vegetarian red wine sauce. You can use your own homemade veggie broth or canned broth. Be aware of the salt content of packaged broth, however, if you need to keep your salt consumption low. For more of a cream sauce, you can use soy or almond milk instead of veggie broth. You can substitute 1 large onion for the shallots, if desired. You can use butter in place of coconut oil, if desired. You can substitute cornstarch in place of flour, if desired.