Heat vegetable oil in a wok. Add fenugreek seeds, black mustard seeds, cumin seeds, asafoetida, and curry leaves. Stir until they crackle.
Add roughly cut onions and crushed garlic. Saute until onions soften.
Pour in tomato juice (blended tomatoes with water). Add coriander powder, red chilli powder, and jaggery. Stir and bring to a boil.
Season with salt and add washed, peeled, and diced sweet potatoes.
Add tamarind pulp (soaked in cold water and strained). Stir well.
Cook until sweet potatoes are tender and the kuzhambu thickens.
Once sweet potatoes are cooked, remove from heat. Serve with steamed rice or Malabar paratha. Enjoy!
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