Place 100gr caster sugar in a small pan and pour over 50ml water. Place on medium heat and stir while bringing it to boil. Let the mixture cool, while cooling two Martini glasses in the fridge. Once the sugar syrup has cooled, pour 1 tbsp into your cocktail shaker and throw in a handful of ice, 100ml vodka, 50ml Kahlua and 50ml freshly-brewed espresso coffee. Give it a good shake until cold. Strain into the chilled glasses and serve with coffee beans for decoration.