In a small saucepan, bring water and sugar to a boil over medium heat. Stir to dissolve the sugar.Once the sugar is dissolved, reduce heat to low, add the mint and simmer approximately 8 minutes.
Turn off the heat and let the syrup steep and cool.Strain out the mint leaves before serving.
Store leftovers in an airtight container in the refrigerator for up to 3 weeks.
Assemble the drink
For sugar rim, dip glass rims into pomegranate juice then coat in red sanding sugar.
Pour 6-6½ ounces of prosecco into the prepared glass.Add mint syrup and pomegranate juice.Garnish with pomegranate seeds and fresh mint, if desired. Serve immediently.
Store syrup in an airtight container for up to one month.