I popped down to the awesome Masala Mart (a warehouse-like Indian supermarket in Greenwich, London) and bought some liquorice twigs. A couple of these were smashed up with a rolling pin, boiled in a little water, strained and then combined with a similar quantity of sugar to make a tasty and dark liquorice syrup. All that was needed was some booze to go with it. Hence the Liquorice Sour was born.
20ml lemon juice
15ml liquorice syrup
1/2 egg white
A dash of Dr Adam Elmegirab's Teapot Bitters
Shake all ingredients hard over ice and double strain into a chilled coupe. Add a couple more drops of bitters on top.