Deliciously AMAZING vegan gravy from Vegan with a Vengeance. Perfect for smothering mashed potatoes. I made this for our Mother's Day meal, and I fell in LOVE with it. They mention in the cookbook that you will be tempted to make this once a week, and I think they are right. There were no vegetarians present at dinner, much less any vegans, but the gravy was well received by everyone! I didn't have mustard seeds the first time I made this, so I used 1 tsp ground yellow mustard and it worked just fine.