Clean grapes by washing them thoroughly. Pat dry and transfer them to a clean bowl. Squeeze some lime juice and toss well to coat the grapes nicely.
Refrigerate the sugar-coated grapes for 10 minutes and allow them to marinate in the lime juice.
Roll each grape in the powdered sugar, making sure they’re all nicely coated. Place them separately on a baking sheet lined with parchment paper.
Freeze the grapes for 2-12 hours or until they’re solid. Once the grapes are frozen, transfer them to a freezer-safe bag and freeze again.
Notes
Keep the frozen candied grapes in the freezer at all times, and remove right when you’re ready to serve. Want these to be healthier? Use monk fruit sweetener or cane sugar instead of regular white sugar. To make the perfect sour patch grapes, use a bit of citric acid too. It’s optional, but I highly recommend using it if you have it at hand.