Total time: 7 hr 20 min • Prep: 20 min • Cook: 7 hr • Serves: 6 • Difficulty: Easy

Slow-simmer soup is a cold-weather comfort food. This one requires just 20 minutes of hands-on time and then your slow cooker handles the rest, producing a flavorful soup with tender pieces of beef. For the lentils, opt for green or brown lentils. They hold their shape better and add more texture than red lentils, which dissolve as they cook (ideal for a smoother soup). Dry lentils don’t need to soak like dried beans do before adding them to the soup, though it is a good idea to rinse them and remove any debris. You can substitute 2 cups of fresh green beans, cut into 2-inch lengths, for the zucchini, and 2 tablespoons of chopped fresh parsley for the basil.