title_body: How to avoid egg white being cooked in drinks?
upvoted_answer: Several suggestions:
  
  
  On a fresh egg, remove the chalazae, the ropey bit in the white (it anchors the yolk);
  Use either pasteurized egg whites or powdered egg whites;
  Add ice only after the mixture has become foamy and voluminous;
  Use a finer mesh strainer (if bits are getting through your shaker strainer).