Demerara and brown sugar look similar on a shelf, both golden brown with large-ish crystals, and it is easy to assume they are interchangeable. They are related, but not quite the same thing.
What brown sugar actually is
Most commercial brown sugar, the kind sold as light or dark brown sugar, is refined white sugar with molasses added back into it afterward. This gives it a soft, fine texture and a consistent molasses flavour, but the molasses is not naturally part of the crystal, it is coating it.
What demerara sugar actually is
Demerara is a raw or minimally refined cane sugar, meaning it keeps much of its natural molasses content from processing rather than having it added back in later. This is what gives it larger, coarser crystals and a light caramel flavour that is more subtle than brown sugar.
The key differences
- Texture: demerara has large, crunchy crystals, while brown sugar is fine and moist
- Production: demerara is minimally processed cane sugar, brown sugar is refined sugar with molasses added back
- Flavour: demerara has a lighter, more caramel-like taste, brown sugar has a stronger, more consistent molasses flavour
- Best uses: demerara suits toppings, crumbles, and drinks where texture matters, brown sugar suits baking where a soft, even crumb is the goal
Can you substitute one for the other?
In baking, brown sugar is usually the safer substitute for demerara if a recipe calls for moisture and a soft texture, since demerara will not dissolve as easily into a batter. For topping a bake, sweetening coffee, or anything where a bit of crunch and a lighter flavour is wanted, demerara is the better choice. This is part of why it is used as the base for Dirty Vanilla, its caramel notes sit naturally alongside vanilla without overpowering it, and it holds its texture well in hot drinks.