Lentil casserole is a dish that is extremely popular as a main course in various regions of the world. How to make a Lentil casserole varies from one place to another, but as per most Lentil casserole recipes the best result is obtained by using either green or brown lentils. These need to be rinsed and boiled over high heat till they are tender. Separately onions, garlic and mushrooms need to be sautÃ©ed and flour, bacon and Worchester sauce needs to be added. Once the mixture if thick, the lentils need to be added and baked for about 20 minutes. Certain Lentil casserole recipes advise sprinkling tomatoes prior to serving. The biggest advantage of Lentil casserole is that it can be prepared in about 30 to 35 minutes. It is considered to be a nourishing dish that has high protein content and is therefore the ideal food for growing children and old people.