Add 1 cup warm water and the sunflower seeds in your blender and start processing. Add in the yeast flakes and cornstarch, followed by the rest of the ingredients, minus the remaining cup of water. Whiz untll smooth and creamy, adding in as much of the last cup of water as your blender can hold without spilling over. Pour in the gravy into a medium size saucepan; cook on medium high heat, stirring occasionally until the gravy thickens. This should only take about 4-5 minutes. Serve hot over brown rice, quinoa, a baked potato and more.