Interestingly enough, in another English recipe, they do say "40%
heated oil" rather than "4 fold".
http://www.chinavista.com/culture/cu...canton2-1.html

What's funny about this recipe is that it calls for "qiandao sauce". It
means thousand-island sauce. Yes that's right, it's Thousand Island
Dressing! they transliterated the translation, not knowing it's
originally English.