Serve in a

Garnish:

Garnish with edible flower (and, optionally, a spritz of edible gold dust if available)

How to make:

Combine all ingredients except champagne in shaker tin. Either dry shake without ice, then add ice and shake vigorously OR add three 1.25" ice cubes and whip shake until tin is frosted cold and ice has almost completely dissolved. Pour mixture through fine mesh strainer into empty collins glass. Top by very slowly pouring brut champagne into the middle of the drink until white foam rises just above the lip of the glass.