Maybe you're counting calories. Maybe you're allergic to eggs. Maybe you're looking to get more protein into your diet. OR, maybe you've always just said "No way-o!" to mayo. This recipe is for you! It's got zip, it's got zing, and it has the perfect balance of tangy, sweet, creamy, and crunchy. Make it open-faced with a base of toasted wholegrain bread, crisp arugula, and caramelized onion. A-mazing!