It looks like a mirrored hemisphere, but what redditor Melissa Rags has made is actually a perfectly glazed cake. How does she get the glaze so perfectly smooth? Her secret is a little bit of corn syrup:
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I’ve used a lot of different recipes for this and have noticed that any one you find that includes a little corn syrup always comes out beautiful and shiny! That and lot of recipes don’t state this but I recommend shaking your container of glaze upon completion. All the bubbles and thick parts with go to middle where you can easily ladle it out. All that’s left is a smooth glaze!