When Meringue Won't Stiffen?
The Best Thing to Do When Your Meringue Mixture Won't Stiffen and Gets Loose and Watery Is to Whisk It Quickly. You Should Do This for as Long as It Takes...
The best thing to do when your meringue mixture won't stiffen and gets loose and watery is to whisk it quickly. You should do this for as long as it takes, which can be up to 15 minutes. This will work even if you've already whisked the mixture and the meringue has fallen flat.
Why are my meringues not hardening?
The sugar in the meringue pulls moisture from the air. Too much moisture means sticky meringues. Linda Jackson and Jennifer Gardner say the trick is to leave the meringues in the oven after baking. Turn the heat off and let the meringues finish drying, undisturbed, for three hours or even overnight.
What do you do if beaten egg whites won't stiffen?
Add Salt and/or Cream of Tartar
Both salt and cream of tartar act as stabilizers and will help the egg whites hold their shape when whipped. Remember: if you do happen to be using a copper bowl, skip the cream of tartar.