Which menu item is known for its spicy flavor at Jack in the Box?

The Spicy Siracha is recognized for its distinctive spicy flavor at Jack in the Box, making it the standout choice in this question. It features a sauce made with Sriracha, which is known for its fiery kick and savory flavor profile. This sauce enhances the dish by adding a level of heat that appeals to customers seeking a spicier option.

Other menu items, while they may have their own unique flavors, do not primarily focus on spiciness like the Spicy Siracha. For example, the Chili Cheese Burger has a rich and hearty flavor but is not specifically known for being spicy. The Fish Sandwich is primarily characterized by its lighter, seafood taste, and the Grilled Chicken Salad leans towards freshness and healthiness rather than heat. This distinction helps clarify why the Spicy Siracha is the appropriate answer when identifying a spicy menu item at Jack in the Box.