Hey Mr Taster!
I found them! Crenellated and with the eggy skin inside, the cabbage and the pork. Not the best egg roll I've ever had but they ARE New York egg rolls! And of course I found them by accident.
I found them because I started heading up State College Blvd looking for Chinese food, and this was the first place I found that wasn't steam-table "dollar Chinese food". It's run by Koreans so on Friday and Saturday nights you can get quite good kalbi... the food is tasty enough, but a bit expensive, especially given its location next to the Metrolink track in a forgotten part of Fullerton practically to Placentia.
Not sure about the mustard and duck sauce as we got them to go and we keep such things at home.
341 S State College Blvd