what to eat to build Muscle

Hi guys, i had surgery 11/22/2008 and am currently down 57 lbs. My blood work was superb to say the least. my concern is I still need to puree alot of stuff to eat without MAJOR discomfort. I exercise cardio/weights 4 times a week and walk on the off days. I eat plenty of protein but I am not as strong as I know I could be. It has been suggested I am not getting enough carbs (the good ones, not sugary stuff). Any recomendations for carbs with the restricted diet meaning soft or pureed foods? of the 57 lbs I believe I am down 15 lbs of lean muscle mass.

What builds muscle mass?  PROTEIN...PROTEIN...PROTEIN