You can try a place called "Old Town Sushi" in San Mateo, California (its around 15-20 minutes driving from San Francisco). Here is the address:  
100 S B St 
San Mateo, CA 94401 
The portion of food over there is large, usually can feed 2 people (if you don't really eat a lot). 
 
As for ramen place, there isn't much to choose from in San Francisco as well. I heard a place called "Santouka Ramen" and they server pretty good ramen. Below is the address but I haven't try it out before. 
675 Saratoga Ave 
San Jose, CA 95129 |