Jaggery is an unrefined sugar. It is a sweetener that's becoming popular as a "healthy" replacement for sugar. Jaggery contains more nutrients than refined sugar because of its molasses content. Molasses is a nutritious by-product of the sugar making process, which is usually removed when making refined sugar. Including the molasses adds a small amount of micro-nutrients to the final product.
According to one source, 100 grams (half a cup) of jaggery may contain (4):
Sucrose: 65–85 grams.
Fructose and glucose: 10–15 grams.
Protein: 0.4 grams.
Fat: 0.1 grams.
Iron: 11 mg, or 61% of the RDI.
Magnesium: 70-90 mg, or about 20% of the RDI.
Potassium: 1050 mg, or 30% of the RDI.
Manganese: 0.2–0.5 mg, or 10–20% of the RDI.