Hold up. What's a shrub?
A shrub is a sweet and tangy syrup made by combining three basic ingredients: fruit, sugar, and vinegar.
The vinegar part might sound weird, but trust: It's good.
Once you've made a shrub, you can use it in drinks (both boozy and non) or as a delicious syrup to drizzle on whatever you want.
There are two main ways to make a shrub: hot or cold.
You can read more about the history of shrubs and the pros and cons of the two methods in this great basic guide over at Serious Eats.