Best Asian grocery store & Asian Buffet
In a small relative area going up to Kearny Mesa to check out 3 big ones.
Mitsuwa which is heavily Japanese focused.
Ranch 99 which is more Chinese and southeast asian. If you want a chinese cleaver, this is the place to go. Grab a ShibaZi or Cleverest Son's Wife, yes that is the brand name. I love my Shibazi.
A little east of Ranch is Zion which recently moved and expanded and is heavily Korean centric.
There are many others about town but those three are close to each other.