How every Indian restaurant makes 20 different curries from one master base

Stand behind the pass at an Indian restaurant for ten minutes and you will notice something: the same thick, brick-red paste goes into nearly every order. Butter chicken, tikka masala, a paneer dish — different plates, same starting point.

That paste is the onion-tomato masala base. Restaurants make a batch of it and build everything on top. Home cooks make each curry from scratch every time. That is the gap, and closing it is mostly about one signal: bhunao.

What the masala base is

It is a cooked-down paste of onions, tomatoes, and aromatics (ginger and garlic) with spices bloomed into it. Ratios vary, but a North Indian base sits around 2:1 onion to tomato by weight. The base is a flavour-saturated carrier; what you add on top of it — protein, cream, a finishing spice — is what makes one dish different from the next.

The bhunao stage — the signal it's ready

Bhunao is the most important and most skipped step. It means frying the masala on medium-high heat, stirring almost constantly, until the oil separates from the paste and pools at the edges of the pan.

That is not a coincidence of appearance — it is chemistry telling you the water has cooked off. While the paste is still wet, it is an emulsion of oil and water and it smells slightly raw and acrid. As the water drops below a threshold, the emulsion breaks and the oil runs free. The flavours are now concentrated and cooked through. That oil ring is your green light.

Step by step: building the base

• Start with a tadka — bloom your whole spices in oil or ghee.
• Add onions and cook them to a deep golden brown, not just soft. Caramelisation is colour, not minutes, and it is where most of the flavour lives.
• Add ginger-garlic paste and cook until the raw smell is gone, about two minutes.
• Add ground spices and stir for 60–90 seconds — they burn fast.
• Add tomatoes and cook until completely broken down.
• Bhunao: keep the heat up, keep stirring, and wait for the oil to separate at the edges. Now the base is ready for your main ingredient.

Cook once, eat all week

This is the part worth stealing from restaurants. The base keeps 3–4 days in the fridge and freezes well for about three months. Make a big batch on a Sunday, portion it, and any weeknight curry becomes a 15-minute job — sear your protein, add a portion of base, finish.

Common mistakes

• Pale onions. Rushing the onions makes a thin, pale base. The deep brown is the flavour.
• Watering it down at the wrong time. A splash to stop sticking is fine; a flood restarts the clock on bhunao.
• Stopping before bhunao. If the oil hasn't separated, the base still tastes raw. It is non-negotiable.
• Watery tomatoes. Hothouse tomatoes dilute the base — Roma or canned whole are far better.

Common questions

What does bhunao mean?

Bhunao (or bhuna) is the stage of frying the masala until the oil separates and pools at the edges of the pan. It signals the water has cooked off and the base is fully cooked and concentrated — the single most reliable doneness cue in Indian cooking.

How long does the masala base keep?

About 3–4 days refrigerated in an airtight container, or roughly 3 months frozen. Portion it before freezing so you can pull out exactly one curry's worth at a time.

Why is my curry base bitter or raw-tasting?

Almost always one of two things: the ground spices scorched (added too early or on too-high heat), or you stopped before bhunao so the base is undercooked. Cook to the oil-separation signal and add ground spices only after the aromatics soften.

Can I make the masala base without onions or tomatoes?

There are regional bases that lean on yogurt, cashew, or coconut instead — but the everyday North Indian base is onion-tomato, and it is the most versatile starting point. Master that one first, then branch out.