If you are offering this drink at a party, you can mix all the ingredients together ahead of time...but add the champagne just before serving so it doesn't lose it's bubbles.
- Muddle the pineapple pieces and Cointreau in the bottom of a mixing glass.
- Add the vodka and pineapple juice.
- Stir well.
- Strain into a chilled cocktail glass.
- Top with champagne.
- Garnish with a maraschino cherry.