1 tbsp. chopped onion
2 tbsp. plus 1 tsp. sugar
2 tbsp. plus 1 tsp. vinegar
1/2 tsp. celery seed
1/2 tsp. salt
1/2 tsp. pepper
1 tsp. dry mustard
1 c. vegetable oil

In blender, mix all ingredients, except vegetable oil. When well combined, slowly add oil.