Our esteemed patriarch Lord Lyre esq. was present at the Groucho Club London when the first ever Espresso Martini was served. As legend has it, a rather famous model asked Dick Bradsell, the godfather of modern cocktails for a drink that, Will wake me up, then f*ck me up. One out of two will be more than adequate.
Method
Dry shake, 1/2 fill shaker with ice, shake hard briefly, fine strain.