Preparation Pour enough cold water over the lentils, onions, carrots, celery, and bay leaves in a 3-quart saucepan to cover by three fingers. Season with salt and bring to a boil over high heat. Adjust the heat so the water is at a gentle boil and cook until the lentils are tender, 20 to 25 minutes. Drain the lentils, discard the bay leaves, and transfer to a large skillet. Pour in the chicken stock and olive oil and season lightly with salt and pepper. Bring to a boil and cook until the liquid is reduced enough to coat the lentils, about 3 minutes. Scatter the spinach over the lentils and toss just until the spinach is wilted, about 1 minute. Taste and add salt and pepper if necessary. Serve immediately. Lidia's Italian-American Kitchen by Lidia Bastianich Knopf