By Veronika Bondarenko Launched in 1998 to promote the movie Mulan, the Szechuan Sauce has only been back a few times since. No McDonald’s (MCD) – Get McDonald’s Corporation Report product causes a stir quite like the elusive Szechuan Sauce. Launched in 1998 to promote the Disney (DIS) – Get Walt Disney Company Report movie Mulan, the sauce quickly disappeared from menus but not from people’s memories and obsessions. From Mulan To Riots: The Szechuan Sauce HistoryFor years since, internet forums would track the Szechuan Sauce in other countries, try to sell saved packages and discuss ways to r…