Dal makhani is a rich, creamy North Indian dish made from whole black lentils (urad dal) and kidney beans (rajma) slow-cooked with butter, cream, and spices, resulting in a velvety, buttery (makhani) texture. Traditionally simmered for hours, often overnight in a tandoor for a smoky flavor, it's a popular, hearty vegetarian curry served with naan, roti, or rice.