Dark Brown Sugar (Best Option)
1:1 by volumeDark brown sugar contains a higher molasses content than light brown sugar, which enhances the caramel and toffee notes in tiramisu. This molasses also contributes moisture, helping maintain the creamy texture of the mascarpone mixture.
When substituting, use the same volume as brown sugar. Ensure it is well packed to match the density. Be mindful that the flavor will be slightly more intense but complementary.
The final tiramisu will have a richer, slightly more robust flavor without compromising texture, making it the closest match to the original brown sugar.