For the syrup:

1. Simmer 2 cups water, 2 cups sugar, and 2 cups cubed cantaloupe for 10 minutes.
2. Let cool. Strain into a jar.
3. Add a sprig of fresh thyme.
4. Keeps up to a month in the refrigerator.

For the cocktail:

1. Add the gin, lemon juice, and syrup to a shaker and shake with ice.
2. Pour the shaken mixture into a stemmed champagne flute and top with sparkling wine.
3. Garnish and enjoy your twist on a traditional French 75!