Try roasting seeds first then mashing them. Then make a roue (spelling) by first melting butter or other fat and then adding mashed seeds. Keep stirring this and then start adding the broth and mixing it small amounts until it becomes like a gravy then adding the gravy to the soup. even if you just add corn starch or flour to a hot soup it will just clump up
RE: Dinner FAIL : To Much Ground Flax Seed