Lentil shepherd's pie is a vegetarian twist on the classic comfort food. It is made with lentils, vegetables, and a creamy mashed potato topping, and can be customized to suit your taste. Some popular variations include adding cheese or breadcrumbs to the mashed potato topping for added texture, or adding mushrooms or spinach for added flavor. Lentil shepherd's pie is a great way to incorporate more plant-based protein into your diet, and is also a great source of fiber and vitamins.