Take one small small boy, and a big bowl of sloes...
...have small boy wash sloes...
...then have him prick a few...
...get bored, and do some drawing while you do the rest...
...then have small boy plop pricked sloes into bottle of gin (trying to avoid alcoholic inhalation where possible)...
...add sugar, and put in a place where you will remember to shake them daily for a while...
Now, wait a while!
Recipe from here.