Celery Soup was a staple in early 20th-century American kitchens, often served in family homes or church potlucks. This version uses fresh celery simmered until tender, combined with a milk-based broth and thickened with flour and butter for a creamy, comforting consistency. The original recipe includes variations with onions and optional additions like chicken, potatoes, or rice, making it a flexible base. It’s beloved for its simplicity, frugality, and the way it elevates humble vegetables into something warm and hearty.