Chill your glass
Place a champagne flute in the freezer or fill it with ice water to get it nice and cold while you prep.

Shake the base
In a cocktail shaker, combine fresh lemon juice and simple syrup. Fill the shaker with ice and shake vigorously until the tin is frosty—about 15–20 seconds.

Strain and sparkle
Discard the ice from the champagne flute if using, and strain the lemon-syrup mixture into the flute.

Top with bubbles
Gently top with non-alcoholic sparkling wine (or grape juice) to fill the glass.

Garnish and serve
Add a lemon twist on the rim or float it right in for a classic touch. Sip and enjoy!