Combine the cranberries, water, and sugar in a saucepan, then bring to a gentle simmer over medium heat, letting the cranberries soften and burst, filling your kitchen with a fragrant, tart aroma.
Use a muddler or the back of a spoon to mash the cranberries further, releasing more juice and creating a chunky syrup.
Pour the mixture through a fine sieve into a bowl or jar, pressing gently to extract all the vibrant red juice and flavor, then discard the solids.
Let the syrup cool to room temperature, then transfer it to the fridge to chill for at least 30 minutes, ensuring it's cold and ready to mix.
When ready to serve, pour about two teaspoons of the chilled cranberry syrup into each flute glass, watching the rich red color swirl invitingly.
Slowly top each glass with the chilled sparkling wine, pouring gently along the side to keep the bubbles lively and the drink effervescent.
Garnish each glass with a few fresh cranberries and a sprig of mint, adding a festive pop of color and aroma.
Serve immediately, enjoying the bright, bubbly, and tart refreshment that makes any occasion special.