I first wandered into this cafe because I assumed their name indicated that they sold Bulletproof coffee, which they do! For those of you who are unfamiliar, Bulletproof coffee is made with 1-2Tbsp grass-fed, unsalted butter and 1-2Tbsp "brain octane oil." It's supposed to boost cognitive performance and weight loss, and from my experience it definitely provides more alertness and clarity than a typical cup of coffee. It does taste like coffee made with butter so I recommend starting off with a small cup to see if you can get through a larger portion. It's not yum, but it's not eww either. It's just different and worth trying if you're keen to optimize your brain and body health.
I've also tried some of their baked goods, which are made on-site and quite reasonably priced. I enjoy this little cafe and definitely recommend others check it out next time you're wandering Roncesvalles and trying to choose a place to grab coffee or a snack.