traditional recipe for Rum Punch:
1 part sour
2 parts sweet
3 parts strong
4 parts weak
which translates as:
Lime juice - 250ml
Sugar syrup (made with 1l water and 400g sugar; put together in saucepan over low heat until sugar dissolved, then leave to cool)
Dark rum - 750ml
Mix ingredients together and serve over ice, with lime wedges.
This makes a big pitcher; for fewer people you can reduce the quantities but keep the proportions the same.
And if you're wondering about the title of today's post, please refresh yourself with this clip from Mary Poppins. The golden moment is at 1:35.