1. Place 10 grapes in the bottom of a shaker and smash up with a cocktail muddle. Pour contents through a sieve and reserve juice.
2. Rinse shaker and place basil in the bottom. Lightly muddle to release oils. Top with simply syrup, grape juice and lemon juice and stir. Add ice and pour vodka over top. Add honey and soda water and shake.
3. Cut two grapes in half and place 2 halves in each glass. Pour shaker contents in glasses and serve.
4. Serves 2.