Combine onion, celery, water, and salt; cook in a covered saucepan until vegetables are tender. Put vegetable mixture through a coarse sieve, or puree in a blender for 2 minutes. Melt butter in a saucepan; add flour and stir until blended. Gradually stir in milk; cook over medium heat, stirring constantly, until slightly thickened. Add salt, sugar, pepper, and vegetable puree. Heat and serve.
Gumbos, Soups, Chowders
Cajun Country -- New Iberia, Louisiana