Our Grade A Dark Robust (formerly Grade B) syrup is blended from sap harvested toward the latter part of maple season. It is dark in color and has a deep robust maple flavor. Many folks prefer Dark Robust for table syrup, baking, and the Master Cleanse diet. Maple Valley Co-op is the leading supplier of organic maple syrup for the Master Cleanse. Organic certification ensures biodiversity, the health of the forest, and nutritious maple syrup.