Chill a large wine glass or highball by filling with ice and set aside. In a cocktail shaker (or mixing glass) add gin, dry vermouth, elderflower liqueur, fresh lemon juice and optional simple syrup. Add several ice cubes to the shaker.

Shake and strain

Vigorously shake for 10–12 seconds until well chilled (if using a mixing glass, stir for 15–20 seconds). Discard ice from the chilled serving glass and place a large ice cube or two into it. Double-strain the shaken mixture into the prepared glass to remove small shards of ice and lemon pulp.

Add Effervescence & Finish

Slowly pour the Prosecco over the back of a spoon or down the inside of the glass to preserve bubbles, allowing about 3 oz. Top with 1 oz club soda to balance the sweetness and adjust fizz.

Taste and adjust: if you prefer a sweeter spritz, add up to an additional 0.25 oz simple syrup and stir gently once to combine. Do not over-stir — you want to keep the effervescence.

Garnish & Serve

Garnish with a thin lemon wheel floated on the surface and a sprig of fresh mint tucked beside it. Give the mint a gentle clap between your palms before placing it to release aroma.

Serve immediately while effervescent. Estimated single serving.