Bacon butties

I have a friend who's been vegetarian for as long as I've known her and that's nearly 50 years. Back in the 1970s she said that the one thing that had made her waiver, when she first stopped eating meat, was the smell of cooking bacon. Bacon sandwiches are a bit of a Thompson family tradition at Christmas time. I like them best with white, flat bread, with butter and with the bacon tending towards crispy. Bacon sandwiches are easy enough to buy in bars in Spain though they're not entirely to specification. They usually come in baguette type bread and, when I order one, I'm usually asked if I want "just" bacon which Spaniards find a little odd; the usual suggestion from the server is to add a little fried cheese or at least some mayo. There is only one remaining chain of fast food sandwich shops in the shopping centres of Spain and they sell lots of bacon rolls from basic ones with just cheese added through to ones that are full of crispy chicken, lettuce,...