Warm French Lentil Salad

In cold weather, there’s something completely pleasurable about a warm, savory French lentil salad. And when I say French, I don’t just mean in the French manner (though this salad is)—you really need to use French lentils. They keep their shape when cooked, and their firm, nutty texture holds up to the acid in an assertive dressing. Ordinary brown supermarket lentils are fine for soup, but for a good lentil salad, you want those beautiful little imported gray-green lentilles du Puy. They c