hi all! i recently saw this video on you tube by nigella lawson when she's doing a white chocolate mousse. however i noticed she placed the whites into the cream and whipped them up together. is this possible? arent egg whites suppose to be fat free ( most importantly ) in order to whip up? so how does the combination of both add up? hope to be verified here's a link to the video ^^ YouTube - Nigella Lawson...White Chocolate Mini Mousse... cheers!