Step 1

Make the Strawberry Puree: Place the strawberry halves in a small food processor and puree until very smooth. Strain the puree through a fine meshed sieve, pressing down with a spatula repeatedly to extract all of the puree, into a medium bowl or measuring cup. This quantity should yield roughly 2 ounces of strained strawberry puree.

Step 2

Assemble: Transfer the strawberry puree to a champagne flute. Add the elderflower liqueur and vodka, and stir with a cocktail spoon. Tilting the glass, slowly add the prosecco. Stir gently, garnish with a strawberry slice, and served immediately.