How to make the perfect espresso martini

Whether it’s sipped after dinner or before the New Year’s Eve celebrations, it’s just the thing – but what are the little secrets to creating perfection in a glass?One of the few ersatz martinis to be worthy of the name, the espresso variety is perfection in a glass; simple, stimulating and utterly delicious, it’s as good after dinner as it is as a short, sharp pick-me-up before heading out for the evening. Perfect if you want to make it to midnight on New Year&rsqu