sentences:  At the White House 2005 Christmas, Thaddeus DuBois, the White House Executive Pastry Chef at that time, decorated snowflake cookies with brushed and piped royal icing.In this case, as with many of the decorated cookies Dubois made for the president, his family and their guests, the traditional royal icing was used, a mixture of raw egg whites, powdered sugar, and a drop of lemon juice.Due to health issues with raw egg consumption, such as salmonella, an egg-free variation of royal icing is sometimes alternatively used by decorators.