Here is a simple trick to cook lentils..or any beans for that matter. Soak them in tap water for 2 or 3 days in a covered pot, change water daily if you remember.
They soften up and actually are more nutritious because they are on verge of sprouting.
To cook, I drain and add new water, dash of white wine, chopped onions, any tomato (salsa or V8 juice or fresh tomato pieces) and small amounts of garlic powder, curry powder, salt, ground cinnamon (helps control my blood sugar) and a bit of soy sauce. If kids are going to eat this, add a pinch of brown sugar. Simmer for 30 minutes, making sure some liquid is present.
Thanks for the bean cooking method.