Avoid This Mistake When Displaying Your Wedding Cake - Tasting Table
Briefly

One of the biggest mistakes you should avoid when displaying your beautiful creation is placing it in direct sunlight, as it's one of the fastest ways to ensure melted, soupy frosting.
If you're looking for a more resistant type, what makes Italian meringue unique is that it can better withstand the heat, compared to Swiss or American buttercream.
No matter which of the many popular cake flavors or types of frosting you select, the best chance you can give it at a long, successful display starts before it even arrives at the wedding reception.
Preparation is key and the confection should be kept as cold as possible in a refrigerator before displaying and serving to your guests.
Read at Tasting Table
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