why won't my lentils cook uniformly?

Question

Whenever I cook black lentils there is always a hard crunchy piece in every bite while other pieces become soft as they should, I start cooking by boiling for about 30 minutes in unsalted water until almost all the lentils are soft. I tried changing my soaking time and boiling time before I add salt but it didn't help. Could it be that the manufacturer is mixing old lentils with newer ones or is there something else.

Answer 1

When cooking any sort of legumes 1) Sort them (if you don't trust it to be pre-sorted) 2) Soak them (make cooking easier, and also more uniform, since they already absorbed moisture) 3) Now you cook them. I don't simmer in the slow cooker, I usually pressure cook them