Yes, you can! In all my years making homemade mayo, I've only had my mayo not turn out once. No matter how great a recipe is, sometimes it happens. So I'm going to tell you exactly how to salvage the mayo if it doesn't emulsify correctly. First, don't panic! Then, set the mayo aside and wash out your food processor. Then, follow the instructions again, but instead of using olive oil, use the runny failed mayo. It should thicken up nicely and salvage your mayo!