Fill a Collins glass with ice. First, add St-Germain, then rosé, then club soda and bitters. Stir well, and garnish with a long lemon twist.
*another dry rosé can be substituted
A rosé version of their flagship cocktail. I altered with rhubarb bitters to brighten it and tone down the elderflower a bit; a longer than normal twist also helps to mellow the sweetness