Oh nice! My variant used Jose Cuervo Especial Silver Tequila (not quite as tasty neat as Rooster Rojo so I thought ideal for this), Martini blanco and Australian Bitters Company Aromatic Bitters (the only bitters I have). The combination works very nicely - silver tequila dominates (not a bad thing!) with the vermouth and bitters adding spicy complexity. No lemon twist (although I could and maybe should have to reduce waste...) this really demonstrates how tequilla can substitute/rival/surpass gin in cocktails! And I love gin (juniper!!!)