Dark Muscovado Sugar (Best Option)
1:1 by volumeDark Muscovado sugar is unrefined and retains a high molasses content, which provides the deep caramel and slightly bitter notes essential for balancing the spices in curry. Its moist texture also helps maintain the desired consistency of the sauce.
When substituting, use it in equal volume to brown sugar. Because it is moist, ensure it is well incorporated to avoid clumping. Taste and adjust seasoning if needed, as it can be slightly stronger in flavor.
The final curry will have a similarly rich and complex sweetness, preserving the intended balance of flavors without noticeable difference in texture or appearance.