Where can I find Old school shrimp and lobster sauce?

[geese]

Transplanted New Yorker who craves old school shrimp and lobster sauce white egg sauce with sparce ground pork on jumbo crunchy shrimp. I opened a antiquarian bookstore here on Elm street in Somerville and while I found after work a few good northern Chinese places Chingdao on Mass ave and Wangs on Broadway I get bored with the perpetual brown sauces. Where can I get great Cantonese and Shrimp and Lobster Sauce without marco polo it to China town?