China Islamic has awesome scallion pancakes. They are very flavorful and not too greasy. They also have wonderful sesame flat bread, with a crisp top and soft, warm, scallion laden center. I love it with a nice house special hot pot! Since its a muslim restaurant, no pork on the menu.
China Islamic Restaurant
7727 Garvey Ave
Rosemead, CA 91770
Dunno about the best, but I like the scallion pancakes at J&J and SinBaLa.
Both are nice and crisp, without being oily. J&J's are a bit meatier, SinBaLa's a bit more dainty, or "fluffy" if you will.
651 W Duarte Rd Ste F, Arcadia, CA 91007
J & J Restaurant
301 W Valley Blvd Ste 109, San Gabriel, CA 91776