Amish Slaw

1 medium head (4 pounds) cabbage
1 medium onion
1 cup granulated sugar

Shred cabbage and onion; add sugar and let stand.

Combine all Dressing ingredients and bring to a boil for 3 minutes. Let cool.

Add to cabbage mixture. Refrigerate overnight. This will keep for a long time.

Dressing:
1 cup vinegar
1 teaspoon salt
1 teaspoon celery seed
1 teaspoon sugar
1 teaspoon mustard
3/4 cup oil