But most pirates saw land more often than navy sailors, and Caribbean pirates ate a lot of fresh fruit. Scurvy was not much of an issue of them. So they ditched the lime and added sugar and nutmeg to make it taste yummy.
Today, some bumbo recipes include cinnamon or grenadine.
Here's a simple recipe:
2 shots rum or dark rum
1 oz water
1-2 tsp sugar
dash nutmeg (& cinnamon if desired)