Stir the sugar with the mint sprigs and 1 1/2 cups water in a saucepan over medium heat until the sugar is just dissolved. Remove from the heat and remove the mint. Let it cool.
To a 2-quart mason jar, add the grape juice, lemon juice and 2 cups very cold water. Add the mint sugar syrup. Put on the lid and refrigerate until cold, at least 2 hours.
Serve over ice with a few lemon slices and grape halves dropped in.
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