1 sm. onion
1 c. mayonnaise
1/3 c. oil
1/4 c. catsup
2 tbsp. sugar
2 oz. Bleu cheese, crumbled
2 tbsp. vinegar
1 tsp. mustard
1/2 tsp. salt
1/2 tsp. paprika
1/2 tsp. celery seed

Put all above in blender except Bleu cheese. Stir in crumbled Bleu cheese.