Pour gin, lemon juice, and simple syrup in a shaker filled with ice. Shake for 10-15 seconds, strain out the ice, and pour into a glass. Pour sparkling wine to the top of the glass. Gently stir. 

Lemon Twist Garnish:

I’ve found that the easiest way to do this is with a vegetable peeler. You can also use a paring knife. Take a whole lemon and peel in a spiral motion around the outside, trying to make the peel as thin as you can. You can then twist it around a straw and hold it for a few seconds – the warmth of your hand will help the peel keep its shape. Place the lemon peel on the rim of the glass and garnish with berries.

Note: I always serve this in a champagne flute or wine glass. I love a coupe glass, but the wide mouth of a coupe will quickly release the carbonation. No more bubbles! The narrow opening of a champagne flute will keep your drink bubbly longer.