Rinse the rice and moong dal together, then soak for about 30 minutes and drain.
In a pressure cooker, heat the ghee and oil. Add the peppercorns, cumin seeds, curry leaves, and grated ginger. Saute for a minute.
Add the soaked and drained rice and moong dal to the cooker. Mix gently so the grains are coated with the tempering.
Pour in 2½ cups of water and add salt to taste. Mix well and bring it to a rolling boil.
Close the pressure cooker lid and cook on medium flame for 2–3 whistles.
Switch off the flame and allow the pressure to release naturally.
Once opened, gently mash the ven pongal using a ladle to get that soft, creamy texture.
In a small pan, heat a little ghee and roast the cashews until golden. Add them to the pongal and mix well.
Serve hot with sambar or chutney.