1 c. oil
1/2 c. ketchup
2 tbsp. onion, chopped
1/2 c. sugar
1 tsp. salt
Juice of 1 lemon
1 tbsp. vinegar
1/4 to 1/2 tsp. pepper
1 1/2 to 2 tsp. celery seed

Put all ingredients in jar and shake well. Refrigerate. Or blend ingredients, except for celery seed, in blender.