1 cup diced fresh pineapple
2 ounces triple sec
20 ounces chilled dry sparkling wine, or as needed
Place diced pineapple and triple sec into a high-speed blender or mini food processor. Blend until smooth, 15 to 20 seconds.
Divide the mixture between 4 champagne flutes. Top each glass with 5 ounces of sparkling wine. Serve immediately.