Before my trips to Spain I always check this site to get useful info of places to go see and where to eat, so I feel its my duty to give back my experiences I just had the joy to have while in spain. Madrid, proceeded to give to the local economy and eat as much as I could:
Casa Mingo, from suggestions here, great chicken and sider, good place for a mellow lunch to relax.
Bar Cervantes: 8 and Leon I think, good place to meet for a drink or 5, if you can get a table eat the pulpo.
Pez Gordo: off grand via I think, funky little joint, with good music and excellent salmorejo. tasty tapas there pretty cheap as well. My friends knew the owner so that might have helped??
Jullian Tolosa: amazing lunch there, chirizo, jamon, salad, white asparragus, if you don't order the T bone steak here, your missing something, cava sorbet, pacheron, excellent wine list. 6 of us had a 3 hour meal there, not skipping anything cost 120 E per couple.
San Sebastian: lots of places were closed for vacation, Akalare, Arzac, but no shortages of places to spend your hard earned euros:
Urepel: Enjoyed fine fillet mignon stuffed w/ Camabert cheese, my wife have Rape/monkfish, both excellent.
La Murela: my friends choice, since he's a life long resident there couldn't argue w/ this one. Nuevo Basque food w/ great atmosphere. I think we had 5 course meal, the best being the free asparagus spoup , good wines/prices...excellent postres there as well..just off of old town.
of course had to do one night just making the traditional rounds on a tapa craw...
many others just can't remember the names, better check the credit card recipts.