What unique ingredient rolls Sydney's Sinful Sundae?

The correct answer is fresh toasted coconut, which is a key component of Sydney's Sinful Sundae. This dessert stands out because the toasted coconut adds both a unique texture and a tropical flavor that enhances the overall experience of the sundae. The combination of creamy ice cream and the crunch of the toasted coconut creates a delightful contrast, making the sundae not just a sweet treat, but also an interesting culinary experience.

In addition to the coconut, the sundae typically features elements like chocolate, caramel, or other toppings that complement the coconut flavor. This focus on coconut makes it distinct among similar dessert offerings at Outback Steakhouse, emphasizing its uniqueness in the menu. The other options do not relate to this particular dessert, as they feature different ingredients that do not contribute to the signature profile of Sydney's Sinful Sundae.