01 - Combine diced beetroot, granulated sugar, lemon juice, and water in a blender. Blend until mixture is completely smooth.
02 - Pass the blended mixture through a fine mesh sieve to separate solids, reserving the syrup in a bowl. Cup and refrigerate until cold.
03 - Divide the chilled beetroot syrup evenly between two tall glasses. Add 1 cup of chilled lemon-lime soda or club soda to each glass and stir gently to integrate.
04 - Place one large scoop of vanilla ice cream into each prepared glass.
05 - Garnish with fresh mint leaves if desired. Present immediately with a straw and long spoon.