More than 60 different types of dal (or dhal) are made across India. The basic dish contains lentils or other legumes flavored with aromatics and spices. Here, yellow lentils (toor dal) and mango are cooked in a more traditionally Southern India style--more souplike. Both ripe and underripe mango will work: less-ripe mango imparts a tart flavor and holds its shape, while riper mango breaks down more during cooking and gives the dish a sweeter taste. Serve over basmati rice or with roasted chicken.