The recent E. coli outbreak is causing some restaurants to remove an ingredient from its menu. Taco Bell, Pizza Hut and KFC are all removing fresh onions from its meals at some locations. In a statement, the parent company said they are making the move out of “an abundance of caution.”  The FDA said silver onions used on McDonald’s Quarter Pounder sandwiches have been identified as a possible source of the E. coli contamination linked to a deadly outbreak.