What is the key ingredient for the build of a crispy fish sandwich?

The key ingredient for the build of a crispy fish sandwich is the Hawaiian bun. This type of bun is known for its slightly sweet flavor and soft, fluffy texture, which complements the crispy texture of the fried fish. The sweetness of the Hawaiian bun helps to balance the savory and deep-fried elements of the sandwich, enhancing the overall flavor profile. Additionally, the softness of the bun provides a pleasant contrast to the crunchiness of the fish, making every bite enjoyable.

While the other bread options may offer their unique flavors and textures, a Hawaiian bun specifically brings that desired sweetness and softness, which are essential in creating a satisfying fish sandwich experience.