Maple syrup
Maple syrup is called for by exactly one recipe on Burgerman. In these builds it is what most people actually taste first, and small changes to it move a recipe more than the patty does. It is used in KFC Chicken & Donuts Sandwich (Copycat). The highest-scoring recipe using it is KFC Chicken & Donuts Sandwich (Copycat) at 6.8 out of 10. It turns up most often alongside salt, butter, chicken breast.
