Creamy Onion Dressing
["1 large onion", "1 tsp. salt", "1 tsp. French mustard", "1 tsp. celery seed", "1/2 c. sugar", "1/3 c. vinegar", "1 c. oil", "1 Tbsp. flour", "1 egg"]
["Add egg to other ingredients to thicken.", "Blend in blender."]
["onion", "salt", "French mustard", "celery", "sugar", "vinegar", "oil", "flour", "egg"]