Here are some tips and tricks for making this recipe:
Keep the bubbly cold until you’re ready to use it.
Pour champagne last, and slowly too. As it bubbles and fizzes over the crème de cassis, it’s easier to gauge how much to fill the glasses.
Garnish with a fresh berry to make the drink really shine.
For a non-alcoholic version, pair blackberry simple syrup or blackberry juice with your favorite non-alcoholic bubbly such as club soda, ginger ale, sparkling cider or sparkling lemonade.