What components generally form the foundation of the Francesinha sauce?

Answer

Beer, tomato, and sometimes red wine or port wine

The sauce is considered the soul of the Francesinha, setting it apart from other sandwiches globally. Although exact recipes are proprietary secrets fiercely guarded by various local establishments (*tascas*), the generally recognized foundation is a thick, rich concoction. This mixture is primarily based on beer and tomato, often augmented with the inclusion of red wine or port wine for added depth. Furthermore, this base is heavily seasoned with piri-piri or other spices, resulting in a complex flavor profile that is savory, slightly sweet, and possesses a noticeable, lingering heat.

What components generally form the foundation of the Francesinha sauce?
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