St Germain Elderflower Liqueur

This offers lovely notes of pear and lychee, balanced by enough tartness to please even the palates of those generally drawn to drier libations. It has an understated yet unmistakable presence, and can hold its own when mixed with a variety of spirits. It's been dubbed "The Bartender's Ketchup" by bartenders because of how it makes so many drinks taste great.