1 sm. onion, chopped
1 c. mayonnaise
1/2 c. salad oil
1/4 c. ketchup
2 tbsp. sugar
2 tbsp. white vinegar
1 tsp. prepared mustard
1/2 tsp. salt
1/2 tsp. paprika
1/4 tsp. celery seed
Dash of pepper
1 c. Blue cheese

Put all ingredients in blender. Blend until smooth. Pour into bowl; add 1 cup crumbled Blue cheese.