Old school madras. Amazing what a difference cooking this way makes. Many years ago I tried with the pan flat (and less oil). Lid on. Some fair results, but it was very hit or miss. Basically turn the heat up and hope for the best. Here we have much more control.
No rush either. Takes the chefs 20 mins plus, commercial burner, no lid. Takes me 40 mins plus. Low gas (lid on). Add another 20 mins (minimum) resting in the TA container (wrapped in foil) to mimic "delivery". There we have it. A 1 h curry made with base gravy. Is it worth it? Yes! With a little experience/practice the taste is, well, old school. I think it was JerryM who first mentioned something about "almost piquant".
Coming along nicely

No stirring after all the ingredients have been combined. Occasionally, "move" some of the sauce/curry (higher up the pan), carefully. Done. No scraping, or as little as possible. Takes practice. No pyrotechnics/showboating either. When happy, tip off excess oil, if you want. One final thing.This is a high temperature curry. Plastic TA container lids may creak, foil/cardboard lids will get soaked in oil. Take appropriate precautions. There may be leakage. A plastic carrier bag will come in handy.
Rob