Dal Makhani / Madras Lentils

I want to try my hand at Dal Makhani--I really like Trader Joe's Madras Lentils which seem to be a version of it. I have no idea if the TJ's stuff is authentic or not, but it's tasty. And I have some black lentils sitting around that I want to use up.

The TJ's stuff contains tomatoes, lentils (pretty sure they are black lentils--they are unlike any red or green or brown lentil I've used), kidney beans, onion, cream, salt, butter, oil, ginger, red chiles, and cumin.

I'm going to play around with this recipe (but without a pressure cooker since I don't have one.) Kasoori methi seems to be fenugreek, but I think I'll leave it out the first time.