Try an oil-free and fat-free salad dressing recipe. This quick fat-free orange and mustard vinaigrette salad dressing uses just a few simple ingredients that you probably already have on hand. It's not thick and creamy, but it imparts a nice flavor. This is a go-to salad dressing when you want something quick and light without too much oil. If you like soy sauce, add a little splash. If you're looking for a fat-free vegan salad dressing recipe, this is a good one to try.