This warm lentil salad with sausage and apple is a hearty and flavorful dish that combines the earthy taste of lentils with the savory goodness of sausage and the sweetness of apple. The lentils are cooked until tender and then tossed with cooked sausage, sautéed onions, and diced apple. The salad is dressed with a simple vinaigrette made with olive oil, apple cider vinegar, and Dijon mustard. It's a satisfying and nutritious meal that can be enjoyed as a main course or a side dish.