Split Pigeon peas ( either green or yellow ) - that are actually considered pulses , which include peas and beans - are also sometimes erroneously referred to and sold as lentils . The urad bean is also referred to as a `` black lentil '' .
Culturally , other pulses are sometimes called lentils but are actually beans or peas , e.g. `` black lentils '' ( urad beans ) .