To make syrup, chop ginger and add to a small saucepan along with the water. Bring to a boil. Simmer for approx. 15 min., then add sugar and continue to simmer for approx. 5 min. Pass through a sieve into a mixing bowl to filter out ginger pieces, then let cool.
Peel cucumber and cut into bite-sized pieces. Add to a mixing bowl and purée. Then, pass through a sieve into another bowl in order to filter out any cores.
Arrange cucumber slice in a serving glass. Add cucumber water, ginger syrup, and lemon juice and stir. Fill glass with ice and pour over extra dry sparkling wine. Garnish with lemon peel. Enjoy!