This punch is inspired by the flavors of the Middle East. Add vodka if desired.
Bring sugar, water, and ginger to a simmer in a small saucepan over medium heat, stirring, until sugar dissolves. Remove from heat. Add mint. Let stand for 30 minutes. Strain. Let cool.
Stir together mint syrup, juice, and nectar in an ice-filled punch bowl. Add seltzer. Garnish with mint.