La Llesca! Oh nice to know... I have never been there... sounds as a typical spanish food, i promise to taste it and write you back my experience.
La Sagrada Familia is so special place. Have you ever been inside? It’s magical! And at nights is also beautiful to stand up in front and admire it illuminated.
Next time you’re coming to visit Barcelona, I advise to dinner some tapas at Cañete, in Raval... so tasty seafood ;)