Optional Ingredients. These ingredients are not necessary, but sometimes it’s fun to jazz up the sauce.Sesame oil. The mayonnaise is delicious as written above, but a touch of sesame oil adds a delightful nuttiness that I’m obsessed with. Add one drop at a time, stir, and taste. It has a strong flavor, and it’s easy to overdo.Sweetener. A little sweetness helps to balance out the bold flavors in this mayonnaise. I typically use a small pinch of monk fruit. A tiny bit of sriracha and dark soy adds depth of flavor, and I like to garnish with toasted sesame seeds and scallions.