Which specific ingredient is placed directly onto the hot fish fillet to allow it to melt slightly?
Answer
Pasteurized Process American Cheese
The specific assembly instructions for the classic Filet-O-Fish mandate the layering of key flavor agents onto the fried fillet. A single slice of Pasteurized Process American Cheese is intentionally placed directly atop the hot, battered Alaska Pollock patty. This placement is critical because the residual heat from the fried fish causes the mild, processed cheese to melt slightly, integrating its creamy texture with the fish before the tartar sauce is applied. This mild melt is deliberately chosen over sharper cheeses like cheddar because it complements the established sweet and tangy balance of the sandwich profile.

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