Boil the Potatoes: Boil 1 kg of potatoes in a pressure cooker for about 3 whistles on low heat. Let them cool, peel the skin, and chop them into cubes or roughly mash them with your hands.
Heat the Oil: Place a pan (kadai) on medium heat and add the oil.
Add the Tempering: Once the oil is hot, add the mustard seeds and let them splutter. Then, add the cumin seeds, a pinch of hing, and the curry leaves.
Sauté the Onions: Add the chopped onions to the pan. Add a little salt at this stage; this helps the onions cook faster and evenly. Sauté until lightly golden.
Cook the Chillies: Add the coarsely crushed green chillies and sauté everything together for about a minute.
Add the Turmeric: Lower the heat slightly and stir in the turmeric powder. Mix well.
Mix in the Potatoes: Add the boiled and chopped potatoes to the pan. Gently mix everything until the potatoes are beautifully coated with the yellow spice mix.
Season and Garnish: Add salt to taste (remember you added a little earlier with the onions). Toss in some fresh coriander leaves and sauté the mixture for 2 to 3 minutes on medium heat.
Final Touch: If you prefer a tangy kick, squeeze a little lemon juice over the top. Garnish with extra coriander leaves, and your delicious Batata Bhaji recipe is ready!