In a large pot, add rice, lentils, salt, turmeric, black pepper, and water. Heat on medium. Once it reaches a boil, turn the heat down to low and cover the pot and let it simmer for 25 minutes. Stir occasionally to ensure it doesn't stick to the bottom of the pot.
After 25 minutes, stir it one last time, turn the heat off, put the lid back on, and let it sit for 5-10 minutes.
Sautéed Cabbage & Onions
While the khichdi is simmering, heat a saucepan . Add cumin seeds. Once they are sizzling and fragrant, add the onion and sautée for 3-5 minutes until they begin to brown.
Add the cabbage, garlic, and ginger to the pan. Season with salt and pepper, and occasionally stir for about 20 minutes.
Serve in a bowl and topped with the sautéed cabbage and onions.