Red onion can be substituted for the sweet onion.
To reduce the fat in this recipe, crisply cook only 4 to 6 strips of bacon instead of using 1 pound. Just before serving, sprinkle the crumbled bacon on top of the salad
instead of tossing it in. Also, select reduced-fat mayonnaise, reduced-fat grated Parmesan cheese, and look for reduced-fat croutons.
The type of sweet onions available in the supermarket will vary depending on where you live and the time of year. Maui and Walla Walla are two of the most common varieties.