Lately I've been obsessing over Beijing Restaurant in San Gabriel. I went a few times last year or so when it first opened, but I've been going back for the lamb dishes.
The dish known on the menu as "Fried with meat" may be my favorite current dish anywhere. It's a Chinese wheat bun with sesame seeds filled with chunks of fried lamb. The lamb is crisply fried on the outside and fall-apart tender inside. The best part is that the salty grease from the lamb soaks into the bun. It's like lamb carnitas. The dish called "pork with cooked pie" (the restaurant has some odd English menu names even by SGV standards) is similar but with a white bun and filled with pork and cilantro. I like the lamb better because of that great crispiness.
The second lamb dish I can't get enough of is "lamb pot" which is actually a lamb stir fry with a huge dose of cumin seeds.
There are a lot of dishes I like at this place, but these two are the ones I continually go back for.