1 (750-milliliter) bottle Champagne or 2 1/2 cups sparkling water
Garnish: lemon slices
How to Make It
Bring first 4 ingredients to a boil, and cook 20 minutes. Cool. Remove and discard lemon and mint; store mixture in an airtight container in refrigerator until ready to serve. Stir in Champagne before serving. Serve over ice; garnish, if desired.