A suspect meat scandal in China engulfed Starbucks and Burger King on Tuesday and spread to Japan where McDonald’s said the Chinese supplier accused of selling expired beef and chicken had provided 20 percent of the meat for its chicken nuggets. Chinese authorities expanded their investigation of the meat supplier, Shanghai company Husi Food Co., a day after Husi’s food processing plant in Shanghai was sealed by the China Food and Drug Administration. Read more at The Washington Post…