Lychee liqueur adds nuance to the lychees' floral notes, but feel free to swap in an equal amount of extra lychee syrup.
2 cups chilled sparkling wine (such as Champagne or prosecco), ¾ cup fresh grapefruit juice, ¾ cup lychee syrup (from one 20-oz. can of lychees in syrup), ½ cup lychee liqueur (such as Giffard), ¼ cup elderflower liqueur (such as St-Germain), Drained lychees and lime and orange wheels (for serving)
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