My dahl always tastes like lentils in spicy dish water
3 options :
Mash some of the lentils - about half so you have some with bite and the rest as a sauce. I just get the potato masher out and get in there.
Too much effort? Chuck some lentils in that will dissolve into a sauce while the more chunky ones cook through. Split and peeled mung dhal is good for that, but split red lentils will do the same
Too much effort? This one will probably make you cringe but a tablespoon of Mayflower curry sauce powder will thicken any curry or dhal. It is Chinese style curry so not authentic in any way, but won’t do anything too awful to the flavour. It is a lot nicer than lentils in spicy dish water at any rate