In a small saucepan over medium-high heat, combine vinegar and sugar, stirring until sugar is dissolved. Bring just to a boil and then remove from heat.
Add mint leaves and stir well. Let the mixture sit until the mint leaves have flavored the sauce to your satisfaction.
Strain the mint leaves out and discard.
Pour in a refrigerator container with a lid to store. This sauce will keep for several months in the refrigerator.
Makes 1 cup.
New Zealand Mint Sauce Recipe: https://whatscookingamerica.net/sauces_condiments/newzealandmintsauce.htm