Last night I had the kurobuta ["black pig"] ramen at menchanko on 55th Street (5th - 6th ave). This is by far the best ramen I've had in NYC -- and corroborated by a cousin who is a ramen freak in japan. Kurobuta is a special kind of pork, translated here as that makes the ramen a cut above the Hakata ramen that Menchanko usually serves (also way better than the pork ramen at Ajisen, which is just nasty). both are pork flavored broth (white, opaque, salty but with a great porky unctuousness that makes it far better in my opinion than the usual soy-, salt-, or miso-based ramen broths). Plenty of red ginger cuts the fat. The pork is marinated in a tangy salty marinade. If you like it order extra on the side (it's called "chaa shuu.")
Kurobuta is translated on the menu as berkshire pork. Don't think they mean Tanglewood.
Getchor ramen while you can -- on sale for 5.75 -- a great deal -- til 10/31. Haven't checked out whether Ony also has this deal (6th avenue village branch of menchanko).
Kurobuta pork is also sold raw at JAS mart on st mark's place, so you can have the total kurobuta experience. More expensive than your usual pork.
Self-described Japanese "ramen evangelist" website in English -- http://www.worldramen.net/index.html