Coffee liqueur: A liqueur coffee is a caffeinated alcoholic drink that consists of a shot of liqueur, mixed with coffee. It is typically served in a liqueur glass, accompanied many times with cream and sugar. Coffee liqueur beverages are served in different fashions and can be found throughout many countries. One of the most popular liqueur coffee beverage is commonly known as Irish coffee. Liqueur coffee beverages are largely classified as cocktails as well as digestifs which are aimed at aiding the digestive process typically after a meal.
Simple syrup: Simple syrup (aka sugar syrup, or bar syrup) is a basic sugar-and-water syrup used by bartenders as a sweetener to make cocktails. Simple syrup is made by stirring granulated sugar into hot water in a saucepan until the sugar is dissolved and then cooling the solution. The ratio of sugar to water is 1:1 by volume for normal simple syrup, but can get up to 2:1 for rich simple syrup. For pure sucrose the saturation limit is about 5:1 (500 grams (18 oz) sucrose to 100 millilitres (3.5 imp fl oz; 3.4 US fl oz) water).