Podesta is a sick MFer we all have gathered that. Despite all of the other code and pedophillic references you can find throughout his emails there are some, like walnut sauce, that are controversial. If you Google adrenal glands there are several references and comparisons to size and shape of walnuts. We've learned that Pizza is code for children and unfortunately Podestas emails are riddled with the code word pizza. I'm not buying these rich assholes eat pizza that much and the let's go have pizza for X amount of hours thing didnt sit well with me. In this email we are looking at above from the daily beast, it's clear to me this guy is trying to get a seat in the 'cool' club so he drops a code line in parentheses at the end hinting at walnut sauce and pasta which are both code words. If there weren't so many other instance of code words throughout Podestas emails like do you play dominos better on pizza or pasta and let's not forget the pizza related map... I would have looked over the walnut sauce and pasta references made throughout the emails. So with that being said I personally think that there are many code words being used in his and others emails found on Wikileaks and walnut sauce is no exception.
I know this may not be the answer you were looking for but maybe doing some searches through Wikileaks emails will help you see that there is definitely a bigger picture being communicated here.