We like our Martinis on the sumptuous side. So we make this one with the Patron Tequila, as specified; but for the Mezcal we use Del Maguey Crema de Mezcal and for the Americano Bianco we use Sirene Aperitivo. For us, this is about as good as it gets with a Martini.
Tried this with a barspoon of agave syrup and three drops of chocolate bitters (Fee's Aztec chocolate bitters are so strong and their dasher is so bad that an eyedropper with them is ideal) and the flavour is absolutely spectacular. This is absolutely a modern classic.