01 - Remove grapes from stems and rinse under cold water. Pat thoroughly dry with paper towels, removing all excess moisture to ensure coating adheres properly.
02 - Place dried grapes in a large mixing bowl. Drizzle with fresh lime juice and agave syrup if using. Toss gently with a spatula or clean hands to coat evenly.
03 - Sprinkle Tajín seasoning over the grapes while tossing continuously. Continue tossing until every grape is evenly dusted with the spicy-sour mixture.
04 - Line a baking sheet with parchment paper. Spread coated grapes in a single layer, ensuring they are not touching for optimal freezing.
05 - Transfer baking sheet to freezer. Chill for at least 2 hours or until grapes are completely frozen solid.
06 - Serve frozen grapes directly from the freezer for the best icy texture and intensified flavor.