Simmer Broccoli and onions in 4 cups of water until the broccoli and onions are tender. Remove 3/4 cups of broccoli heads and set aside. Cook the remainder of broccoli and onions until soft. Remove from heat and strain broccoli and onions.
In a blender pour remainder of broccoli and onions add celery salt, seasonal, sugar and milk. Blend until all are smooth. Pour mixture into a saucepan, add the 3/4 cup of broccoli and simmer on a medium low setting for 20 - 25 min.
Great served with crusty hard rolls and a selection of cheeses.