classic rhyme from down island

"One of sour
Two of sweet
Three of strong
Four of weak
A dash of bitters
And a sprinkle of spice
Serve well chilled with plenty of ice"

This actually works when you don't have what you want and have to wing it using whatever is on the boat

sour - fresh squeezed lime/lemon
sweet - simple syrup
strong - rum (duh)
weak - water or juice
spice - nutmeg or cinnamon