Pour the cava into a Champagne flute.

While the bubbles dissipate, combine, lime juice, St Germaine, and ice into a cocktail shaker.

Shake for approximately 30 seconds then strain into the flute. (Note: this will cause the Cava to bubble up, so pour a little of the mixture into the flute and once the bubbles go down, finish filling the flute with the strawberry mixture until full.)

Garnish with a lime slice.