Francesinha is a Portuguese sandwich, originally from Porto, made with layers of toasted bread and assorted hot meats such as roast, steak, wet-cured ham, linguiça, or chipolata over which sliced cheese is melted by the ladling of a near-boiling tomato-and-beer sauce called molho de francesinha.
(rant)
and (smokey) whiskey, and corn starch, onions, garlic, and a choice of chicken / beef / shellfish stock… and (piri-piri) hot sauce (optional, if you’re mid)…
I don’t know if OP just did a short-hand of the sauce, but I was in a restaurant (this was not in Porto…) where the owner classified it as a “tomato-and-beer sauce” and indeed it was… a vegetable soup, and it wasn’t pleasant at all.
The sauce is the most important thing in the Francesinha. Anyone can do a fry-up and stick it between two slices of bread and top it with cheese.
There’s a good Francesinha sauce recipe in the Thermomix/Bimby database; that can be anyone’s baseline. (/rant)
That Francesinha looks great, I wish I could find a decent place in my town to eat one.