Thakkali Mozhagu Aracha Kuzhambu (Tomato 'Kuruma' Spiced Gravy)

Peel the ¾ kg of small onions for the paste and keep them whole (they'll be sautéed and ground). Separately, finely chop the 150g of tempering small onions into squares.

Heat a heavy-bottomed kadai over medium heat. Add 2-3 tablespoons of the groundnut oil (from the 200 ml total — save the rest for tempering).

Drop in the ¾ kg of whole small onions, the peeled garlic cloves, the ginger piece, the whole spices (1 cinnamon piece, 2 cloves, ¼ tsp poppy seeds, ¼ tsp fennel seeds), the 6-7 dry red chillies, and a small handful of curry leaves all together.

Sauté patiently on medium flame for about 2 minutes — the onions should turn slightly soft and translucent, the spices should release their aroma, but DON'T let anything brown deeply or burn.

Add the 2 handfuls of grated coconut. Toss it in the residual heat for just a few seconds — you want it warmed but NOT roasted brown.

CRUCIAL TURN-OFF STEP: turn off the stove FIRST, then add the 3 tablespoons of kuzhambu thool (sambar powder). Mix it well in the residual heat of the pan so the raw smell of the powder fades WITHOUT burning. Adding powder to a hot flame = burnt masala = bitter gravy.

In the same kadai (don't wash it — the residual flavor matters), add just a tiny drop of oil and the chopped country tomatoes, the ½ tsp turmeric powder, and a little crystal salt. The salt trick: adding salt now makes the tomatoes break down significantly faster.

Once BOTH the sautéed onion-spice mixture AND the cooked tomatoes have cooled completely to room temperature, transfer everything together into a large mixer jar.

Heat a large vessel (big enough to hold the final gravy) over medium-high heat. Pour in the REMAINING groundnut oil (about 100-150 ml of the 200 ml total).

Add the 1 tsp mustard seeds and let them splutter completely.

Toss in the 150g finely chopped small onions, the 4-5 slit green chillies, and a generous handful of fresh curry leaves. Sauté until the onions are soft but still hold their shape — do NOT over-fry them into a mush. You want them sweet but with a slight crunch left.

Pour the freshly ground smooth paste directly into the tempered vessel. Stir well to deglaze.

Add enough water to bring the gravy to a SLIGHTLY FLOWY, sambar-like consistency — not a thick paste, not watery either. Critical: this gravy MUST stay slightly flowy. If you make it too thick (especially by adding pottu kadalai — explicitly forbidden here), it ruins the dish.

Taste and adjust salt if needed. Cover the vessel and let the gravy come to a rolling boil for 8 to 10 minutes — until the raw smell of the masala completely vanishes and the groundnut oil floats beautifully to the top as a glossy red layer.