Do you like Indo treats like Getuk, Spekkoek or Bakpia?
Then you owe yourself a trip to Tip Top Market in San Gabriel (same strip mall as Luscious Dumplings).
I would pass on the Bika Ambon, however. It's not always available, which is probably better any way, since it's just not very good. Awful, in fact. So spare yourself the trouble. I'll take care of it for you.