Dark Brown Sugar (Best Option)
1:1 by volumeDark brown sugar contains a higher molasses content than light brown sugar, which closely replicates the flavor complexity and moisture of standard brown sugar. This helps maintain the sauce's rich, caramelized undertones and prevents it from drying out.
When substituting, use the same volume as brown sugar. Stir well to ensure even dissolution, as the molasses can sometimes clump. Monitor sweetness and adjust slightly if desired.
The final tomato sauce will have a very similar taste and texture, preserving the intended balance of sweet and savory notes.