Onion Salad Dressing - cooking recipe

Ingredients

1/4 c. vinegar
1/4 c. water
1 c. sugar
1 tsp. salt
1 tsp. dry mustard
1 small onion
1 tsp. celery seed
3/4 c. oil

Preparation

In blender, mix first 7 ingredients.
Slowly add oil.
Most of the time, I also add some catsup.
Blend.