1 sm. onion, cut up
1 c. mayonnaise
1/3 c. salad oil
1/4 c. ketchup
2 tbsp. sugar
2 tbsp. vinegar
1 tsp. prepared mustard
1/2 tsp. salt
1/2 tsp. paprika
1/4 tsp. celery salt
Dash pepper
1 c. crumbled bleu cheese

Put all ingredients, except bleu cheese, in blender and blend until smooth. Stir in bleu cheese. Chill. Makes 2 1/2 cups.