1 c. salad oil
1/2 c. white vinegar
1 c. white sugar
1 tsp. salt
1 tsp. dry mustard
1/4 c. onion, chopped
1 tsp. celery seed

Place all ingredients in blender and blend until well combined and thickened, about 1 minute. Refrigerate several hours or overnight and stir or shake before adding to cole slaw.