This drink is similar to the French Tart.
The Romarin captures the appeal of Le Diplomate in miniature: French accents, generous hospitality, and a touch of everyday occasion. Stephen Starr’s Washington brasserie opened in 2013, bringing its Parisian café sensibility to 14th Street; by 2015, the Romarin was already appearing in accounts of leisurely brunches there. Its name is French for rosemary, the herb that gives the cocktail its distinctive aromatic character. Its documented history belongs to the restaurant’s own modern story, where a memorable house drink can become as much a part of the experience as the bread basket or sidewalk tables.
The combination is inviting: gin, St-Germain elderflower liqueur, grapefruit, and rosemary. Elderflower’s fragrant sweetness softens grapefruit’s tart, gently bitter edge. Rosemary supplies the crucial savory note, its piney aroma adding definition to the fruit and flowers.

Garnish with a small slice of grapefruit or rosemary sprig.