Fill a cocktail shaker with ice. Add the gin, lemon juice, agave nectar, ginger juice, and a handful of crushed ice ice. Shake for 20 seconds, then strain into two glasses. Top with a splash of sparkling water. Garnish with lemon peel.
*I like this brand of ginger juice, I usually get it at Whole Foods, Central Market or Wheatsville Coop. It lasts awhile in the fridge and it's great for smoothies as well.
Recipe by Love and Lemons at https://www.loveandlemons.com/lemon-ginger-gimlets/