To prepare the Dal Khichdi, first clean, rinse, and soak the lentils and rice together in water for 10 - 15 minutes or so. Set them aside.
In a pressure cooker heat 2 tablespoons of ghee/cooking oil over medium flame. Add the chopped onion. Stir and saute over medium heat or till the onion becomes golden in color.
Add the chopped tomato, spices, salt, and cook the masala till tomatoes are mushy.
Drain water from soaked dal and rice. Add diced potato and soaked lentil – rice mix to the pressure cooker. Stir to mix nicely and fry for a few seconds.
Add water. Stir to combine. Seal the pressure cooker. Cook dal khichdi over low heat for 1 - 2 whistles. If you are using Instant Pot or electric pressure cooker, 6 – 8 minutes is the cooking time.
Once cooking time is over, turn off the heat. Let the steam release naturally from the pressure cooker.
Meanwhile, prepare the tempering. Heat ghee in a small pan. Add cumin seeds, red chili powder, and whole red chili. Cook for 10 – 20 seconds to infuse flavors into the ghee.
Open the lid of the pressure cooker and pour hot tempering over the khichdi. Mix and serve.
Serve Dal Khichdi warm topped with ghee along with raita, salad, and papad.