Portobello Mushroom Gravy Portobello Mushroom Gravy By Lucia Tiffany, MPH, RN, CLC For more from Lucia, visit The Harvest Cook website. Please login to print. Ingredients 1⁄4 cup Smart Balance margarine2 1⁄2 cup cubed Portobello mushrooms1 cup diced onion1 1⁄2 tsp salt, divided1⁄2 cup whole wheat pastry flour, or spelt, or unbleached white (with germ is preferable)2 cups unsweetened soymilk, original flavor2 cups water1 Tbsp vegetarian chicken-style seasoning Instructions Please login for recipe instructions and more. Angie.David2021-11-18T11:45:38-05:00