Spinach Salad

1/4 cup diced red onion
2/3 cup white sugar
1 teaspoon ground black pepper
1/2 teaspoon celery salt
1 tablespoon mustard powder
1 cup vegetable oil
1/3 cup white wine vinegar
4 eggs
10 ounces fresh spinach - chopped, washed and dried
1 head iceburg lettuce- rinsed, dried and chopped
1/2 pound bacon - cooked and crumbled
1 1/2 cups crushed croutons
1 red onion, sliced in rings

Mix all together