1. Heat oil in large saucepan over medium heat. Add leek, garlic, and rosemary. Sauté 3 minutes, or until leek softens. Sprinkle flour over leek. Stir 3 to 4 minutes, or until flour starts to color.
2. Add Rich Vegetable Broth and remaining ingredients, and bring to a boil, whisking constantly. Reduce heat to medium-low, and cook 50 to 60 minutes, or until gravy is reduced to about 1 2/3 cups, stirring occasionally. Season with salt and pepper, if desired.