1 med. cabbage, shredded moderately fine
2 med. onions, sliced thin

DRESSING:

1/2 c. sugar
1/2 c. white vinegar
1/3 c. oil
1 tsp. salt
1 tsp. dry mustard
1 1/2 tsp. celery seed

Combine the 5 ingredients. Cook uncovered until it boils. Stir and mix in the celery seed. Pour hot over the slaw. Mix well; cover. Refrigerate overnight or several hours. Stir occasionally.