Brown sugar is white sugar combined with molasses, which gives it a soft texture. Light and dark are the two most common styles of brown sugar. In general, the lighter the brown sugar, the more delicate the flavor. Very dark or old-fashioned brown sugar has a more intense molasses flavor. Both granulated and liquid brown sugar are also now available.
Store in a plastic bag. Resoften by including an apple wedge with the brown sugar in a plastic bag and sealing tightly for 1-2 days.
1 cup packed brown sugar = 1 cup granulated sugar
1 cup brown sugar = 1 3/4 cups powdered sugar mixed with 1 1/2 teaspoons molasses