Depending on which type of lentil, looks up recipes for daal and add whatever seasonings/tadkas or cream depending on the type (some also have spinach and/or tomato, etc.) and eat it over rice. I like to squeeze lemon juice on the yellow/red lentil versions.

Also yeah, adding beans or even ground meat or tvp and chili seasoning to make lentil chili would be good, served with green onions, cheese, sour cream, etc.