Aunt Grace'S Salad Dressing
["1 medium onion", "1/2 tsp. salt", "1/2 tsp. pepper", "1 tsp. celery seed", "1 Tbsp. prepared mustard", "1/3 c. vinegar", "2/3 c. sugar", "1 c. oil or less"]
["Whirl all ingredients in blender for 1 minute.", "Stores well in refrigerator.", "Quick, easy and delicious!"]
["onion", "salt", "pepper", "celery", "mustard", "vinegar", "sugar", "oil"]