Stuff boiled in sugar shacks

SAP

Think of the sticky liquid tapped from trees before it becomes syrup.

In sugar shacks, maple sap is the raw liquid collected from trees that gets boiled down to make syrup. The clue plays on the word "stuff" to hint at the unprocessed form before it becomes syrup. "Boiled in sugar shacks" is a direct nod to the traditional process of turning sap into maple products.