Then boil then for 10 minutes to remove toxins. Now cook until soft in the pressure cooker or just on the hob. For lentils on the hob this takes around 30 minutes, for beans around 1 hour. It is much quicker in the pressure cooker and timings should be given in your instruction manual.
I got 5 bags of lentils weighing 400g each, the same as a tin, for a total cost of 36p including fuel. The dried lentils were reduced to 22p so that helped to make the saving very good indeed ! A tin of lentils can be quite expensive so this is well worth doing. Do you use dried beans ?