so if you make a batch of royal icing and have left overs, do you keep sealed room temp or refrigerate if planning on using in next day or two, what is best?
My experience has been that icing made with meringue powder doesn't keep very well, a couple of days or so like prterrel said. Icing made with regular eggwhite has been fine after a week.
I store it by scraping into the corner of a regular plastic freezer bag, express all the surrounding air then tie firmly. Then you can snip off the bag corner, drop into a piping bag and off you go when ready to use.
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