What is a specific topping on the buster's bacon burger?

The specific topping on the Buster's Bacon Burger is bacon jam, which is a distinctive ingredient that adds a sweet and savory flavor profile to the burger. This topping is made by cooking down bacon with onions, sugar, and other seasonings to create a jam-like consistency. The inclusion of bacon jam enhances the overall taste experience, complementing the savory elements of the burger while contributing a unique twist.

BBQ sauce and blue cheese are popular toppings for burgers but are not specifically associated with the Buster's Bacon Burger. Similarly, while guacamole can be a delicious addition to various dishes, it does not define this particular burger's flavor profile. Thus, bacon jam stands out as the correct choice, as it is specially crafted to elevate the Buster's Bacon Burger.