Roast the Sandge: Heat a very small amount of oil in a pan. Add the sandge and roast them on medium-low heat for 2-3 minutes until they turn slightly reddish and emit a lovely aroma. Remove them from the pan and set aside.
Temper the Spices: In the same pan, add about ½ ladle of oil. Once hot, add the mustard seeds, cumin seeds, curry leaves, and a pinch of asafoetida.
Sauté the Aromatics: Add the finely chopped onions (use a generous amount for this recipe) and sauté them until they turn soft and translucent.
Add Ginger-Garlic & Tomato: Stir in the crushed ginger-garlic paste and sauté briefly. Next, add the chopped tomato and cook for another minute until it softens up.
Mix the Dry Spices: Turn the heat down to low. Add turmeric powder, salt, and Kanda Lasun Masala. Mix well and roast this masala paste for 1-2 minutes.
Combine Sandge: Add the previously roasted moong dal sandge into the spiced onion-tomato mixture and toss them well to coat.
Cook with Hot Water: Pour half a glass of hot water into the pan. Cover the pan with a lid and let the bhaji cook on a low flame for 10-15 minutes. Stir occasionally so it doesn't stick to the bottom.
Final Touch: Once the sandge puff up, soften, and are fully cooked, you can optionally mix in some roasted peanut powder for extra texture. Serve hot!