Lentils are carefully cleaned before they are packaged, but poorer-quality lentils sometimes do slip by. Carefully sort through the lentils and remove any that are too light or dark. It is good to rinse the lentils in water before cooking to be sure they are clean.
We like the flavors and colors of the broccoli, cauliflower and carrots, but feel free to use any vegetable blend that you like and be creative with this casserole. The same goes for the flavor of the soup-cream of mushroom or cream of broccoli also would make a tasty dish.
Sprinkle a cup of shredded mozzarella cheese over the top of the casserole before serving. The heat of the dish will soften the cheese. Sliced process American cheese, cut into strips, or shredded process cheese loaf also works nicely because the cheese will melt on top of the hot dish.