Homemade salad dressing doesn't need to mean a simple vinaigrette. Sure, whisking together mustard, vinegar, and oil is the fastest way to dress your greens, but sometimes you want more, something rich and creamy. You don't need to buy it in a bottle, and you don't necessarily need to use mayo (though of course you can). All kinds of things can make dressings creamy: in some cases a blender or a food processor are necessary, but sometimes all you need is a whisk. So just open your fridge and see if you have any of these ingredients, then build a creamy dressing around it: