Split red lentils are the thing for a bog standard BIR dahl, they turn a watery yellow colour as they cook, a quarter tsp of turmeric helps give a nicer colour, they should cook in about 25/30 mins.
Am I alone in thinking they've got a lot dearer over the last year or so, seems to me like they've doubled in price no matter where you get them, bummer.
Regards
CoR