Perfect with an nespresso shot. The crema is key. Will try with a little bit of creme de cacoa or frangelico as variation
I'm doing it with Frangelico at my working place, the girls love it! Something else that I really like is to use a brandy instead of Vodka and Frangelico instead of Kalua and add a little bit of sugar... But this has became a totally different cocktail, I called it Espresso del Frate