Start with a large, preferably chilled, champagne glass;
1 oz. sharp gin, e.g. Bombay Sapphire East,
one squirt agave nectar or other unprocessed sweetner,
3–5 dashes Peychaud's Bitters,
Vigorously stir ingredients until thoroughly mixed;
Fill glass 3/4 + full with dry champagne,
Top off with 1 oz. orange juice and a small ice cube:
See also the orange zipper.