Aunt Ruby's Refrigerator Slaw

• 1 large cabbage
• 2 medium onions
• 1 large green pepper
• 1 cup vinegar
• 1 cup sugar
• 1.5 cups vegetable oil
• 1 T salt
• 1 T dry mustard
• 1 T celery seed

Mix vinegar, sugar, vegetable oil, salt, dry mustard, celery seeds. Bring to a boil. Let cool, add to chopped cabbage, pepper, onion. Mix well. Refrigerate. Let stand for 24 hours. Will keep in refrigerator for weeks. The longer it stands the better it is.