Place the grapes into a large bowl.
Juice the limes into the bowl. Stir to combine.
Let soak in the lime juice for 5-10 minutes.
Place half of the grapes into a separate bowl.
Add 1 tablespoon of sugar. Toss to combine.
Spread the grapes out evenly onto a parchment lined baking sheet.
Take the other half of the grapes, add to the separate bowl just used.
Add remaining 1 tablespoon of sugar and the 1 tablespoon of Tajin seasoning. Toss to combine.
Spread grapes out evenly on to the remaining half of the parchment lined baking sheet.
Put the baking sheet into the freezer for 2-3 hours.
Once completely frozen, the grapes can be transferred into an airtight container for storage.
Store in the freezer and take out when ready to enjoy!