This easy lentil dal recipe really brings the heat. The term dal refers to both this soup-like Indian dish and the word for split lentils. The lentils used here are common because they don't require any pre-soaking and cook quickly. They're simmered down in a tomato broth with lots of warm, bold spices. It's a surprisingly filling dish that is great for cold cozy nights and quick meal times. The spiced oil that gets drizzled over top is optional, but highly encouraged. The yogurt will help balance out the spiciness and the acidity of the dish. Sour cream works as a great substitute.