@Meeyori you need to try this
Pluck em out from stems, wash grapes and just tap them with napkin or smth to remove water from washing them earlier, juice out 2 limes or lemons and mix it up so that grapes are covered in lime or lemon juice, sprinkle sugar on it (per wish), put it in baking pan and in freezer for an hour
It is crunchy, cold, sour, sweet, fruity snack