What are the traditional base ingredients for the Francesinha's defining savory gravy?

Answer

Tomato and beer

The thick, savory gravy that forms the essential character of the Francesinha traditionally uses a base mixture derived from tomato and beer. This sauce is a crucial differentiator among establishments serving the dish. While some variations might include subtle hints of Port wine or an added measure of spice to elevate the flavor profile, the fundamental components upon which the sauce is built are tomato and beer, setting it apart from simpler sandwich toppings. This rich sauce is what ultimately transforms the meat and bread layers into the substantial, sauce-drenched experience that requires silverware to consume.

What are the traditional base ingredients for the Francesinha's defining savory gravy?
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