I'm looking for good Halal food in Madrid.
I am afraid I can't personally recommend halal food in Madrid. However, I know a great team of halal foodies in London that may be able to help. They run an international magazine Halalgems: email info(at)halalgems.com or ping them on twitter (at)HalalGems and just mention I intro'd you (Alex Jorge or A Fork in London).
Good luck in your search and happy eating!