Remove the seeds from the watermelon slice.

Cut the watermelon into cubes and place them in a blender.

Blend until smooth to create fresh watermelon juice. If you prefer a smoother texture, you can strain the juice through a fine-mesh sieve.

In a cocktail shaker, combine 2 oz of AU Vodka, 1 oz of triple sec, and 1/2 oz of freshly squeezed lime juice.

Add the watermelon juice to the shaker.

Fill the shaker with ice and shake well until the mixture is chilled.

Strain the mixture into a large glass filled with ice.

Top off the drink with 3 oz of champagne or Prosecco.

Garnish with a small watermelon slice or a lime wheel on the rim of the glass.

Serve immediately and enjoy your refreshing Watermelon Vodka Refresher.