Brew guide · 9 min read
South Indian filter coffee, done properly.
Roughly two-thirds of the coffee drunk in India goes through a steel filter, and almost every guide to it stops at “add powder, add water, wait”. This one does not.
Use 25g of fresh, filter-ground coffee in the upper chamber of a steel filter. Level it, press gently with the disc, and pour 200ml of water just off the boil in two stages — 40ml first, wait a minute for it to bloom, then the rest. Cover and leave it for 15–25 minutes. You will get roughly 120–150ml of decoction. Mix 1 part decoction to 3 parts hot milk, sweeten, and pour it between tumbler and dabara four or five times before drinking.
1. The filter itself
An Indian coffee filter is two stacked cylinders. The upper chamber has a perforated base; the lower one catches what comes through. A pressing disc sits on top of the grounds and a lid goes over everything. There is no paper, no pressure and no pump — gravity does all of it, slowly.
Size. Filters are sold by how many cups of decoction they make. A 150–200ml filter suits one or two drinkers; 300ml+ makes sense for a family. Buy for how much you actually drink — a half-empty upper chamber drips unevenly.
Steel or brass. Stainless steel is what almost everyone uses now: cheap, dishwasher-safe, and it does not react. Brass is traditional, holds heat noticeably better, and needs polishing. Heat retention genuinely matters here, because the brew takes twenty minutes and a cold filter stalls halfway through. If you have brass, use it.
Hole size matters more than material. Cheap filters are punched with holes that are too large, which lets fine grounds through and gives you a muddy decoction. If yours consistently produces sludge, it is the filter, not your technique.
2. The grind — the part everyone gets wrong
This is the single biggest variable and almost nobody talks about it.
Filter coffee grind sits between espresso and pour-over. Think fine table salt, or slightly coarser than what you would put in a moka pot. Too coarse and water rushes through in five minutes, giving you a thin, sour decoction. Too fine and it compacts into a plug and never drips at all.
Supermarket “filter coffee powder” is usually ground correctly for this — that is the one thing it gets right. If you are grinding fresh at home, this is a fine setting on a burr grinder, not the medium you would use for a V60. And do not use a blade grinder: the mix of dust and boulders you get from one will clog and channel simultaneously.
Choose the South Indian filter grind at checkout and we will grind it for the dabara, not for a pour-over. It is a genuinely different setting and most roasters do not offer it.
3. 80:20, 70:30 or pure? The chicory question
Chicory is a roasted, ground root. It has no caffeine and it is not coffee — but it is not an adulterant either, whatever the internet tells you. It was blended into Indian coffee during the wars when coffee was scarce, people liked what it did, and it stayed.
What chicory actually contributes:
- Body. It makes the decoction noticeably thicker and darker.
- A slower drip. Chicory swells and holds water, which extends contact time and strengthens the brew.
- A woody, caramel bitterness that stands up to a lot of hot milk and sugar without disappearing.
| Ratio | What it means | Who it is for |
|---|---|---|
| 100% pure | Coffee only. Lighter decoction, faster drip, all the aroma and origin character intact. | People who want to taste the actual coffee. Specialty beans belong here. |
| 90:10 | A whisper of chicory for body, minimal flavour interference. | The best starting point if you are moving from packet powder to fresh beans. |
| 80:20 | The most common commercial blend. Balanced, thick, unmistakably “filter coffee”. | Most households. This is what the taste in your memory probably is. |
| 70:30 | Strong chicory presence. Very dark, very thick, cheaper per cup. | Tamil Nadu tradition, and roadside kaapi. |
| 60:40 and beyond | Chicory is now the dominant flavour. | Almost always a cost decision, not a taste one. |
There is no correct answer, but there is an honest one: know what you are buying. A lot of packets marked “filter coffee” do not print the ratio at all, and a surprising number of “80:20” products are not 80:20.
4. The method
Filter kaapi — two cups
25g : 200ml · 20 min5. Milk, sugar and the dabara pour
The milk should be hot, not warm. Bring it almost to a boil. Cold or lukewarm milk drops the temperature of the whole drink below where the aromatics work, and it is the difference between a good kaapi and a disappointing one.
Full fat, or toned. Full-fat gives you the classic texture. Toned milk is what most Indian households actually use and it works — you just get a lighter body. Plant milks split with a strong decoction unless they are barista formulations.
The pour is not theatre. Moving the drink between the tumbler and the dabara from a height does three jobs at once: it aerates the coffee, it builds the characteristic froth, and it cools it from scalding to drinkable. Four or five passes. If it is not frothing, you are pouring from too low or your milk was not hot enough.
6. When it goes wrong
| Problem | Why | Fix |
|---|---|---|
| It will not drip at all | Grind too fine, or the disc was pressed too hard, or the coffee was heaped rather than levelled | Press more gently. Go one step coarser. Do not tamp. |
| Drips through in five minutes | Grind too coarse | Go finer. Coarse grind and a fast drip is the most common home mistake. |
| Decoction is thin and sour | Under-extracted: too coarse, too little coffee, or the water was not hot enough | Finer grind, more coffee, water just off the boil. |
| Harsh and bitter | Over-extracted, or the coffee is roasted too dark, or it sat in the filter for over 45 minutes | Decant the decoction once it has finished dripping. Try a medium roast. |
| Muddy, sediment in the cup | Filter holes too large, or grind too fine for that filter | Coarsen slightly, or replace the filter. |
| Tastes flat and papery | Stale coffee. Powder that has been open for a month has nothing left in it. | Buy smaller quantities, more often, with a roast date on the pack. |
7. Can you use specialty coffee in an Indian filter?
Yes, and the specialty industry’s decision to pretend otherwise is one of its stranger blind spots.
The Indian filter is a long-immersion, fine-grind brewer. It is not fussy about origin; it is fussy about grind and freshness — the two things supermarket powder is worst at. Give it a fresh, well-roasted, medium-to-medium-dark single origin ground to the right size and it will produce a decoction with more sweetness, more aroma and less of that flat woody bitterness than anything from a packet.
Two things to keep in mind:
- Very light roasts fight the format. A bright, acidic Ethiopian-style roast turns sour against hot milk and sugar. Medium to medium-dark works far better here.
- You may want less chicory, or none. If you have paid for a traceable estate lot, 20% chicory will bury most of what you paid for. Start at 90:10 or pure.
The honest version of the argument is not “specialty coffee is better than filter coffee”. It is that filter kaapi is a demanding brew method that most people are executing with stale powder — and it responds to fresh beans more dramatically than almost any other method.
Common questions
Filter coffee, answered.
How much coffee powder for one cup of filter coffee?
About 12–15g of coffee to 100ml of water gives roughly 60–75ml of decoction, which makes one strong cup when mixed with 120ml of hot milk. For two cups, use 25g of coffee and 200ml of water.
Why is my filter coffee not dripping?
Almost always because the grind is too fine or the pressing disc was pushed down too hard. The disc is there to settle and level the grounds, not to compress them. Press gently, and if it still stalls, go one step coarser on the grind.
What is the difference between 80:20 and 70:30 filter coffee?
The numbers are the ratio of coffee to chicory. 80:20 is 80% coffee and 20% chicory, which is the most common commercial blend. 70:30 has more chicory, producing a darker, thicker, more bitter decoction that is also cheaper per cup. Neither is more authentic; 70:30 is more common in Tamil Nadu.
Can I make filter coffee without chicory?
Yes. 100% coffee makes a lighter, faster-dripping decoction with far more aroma and origin character. You may want to use slightly more coffee to compensate for the body chicory would have added.
How long does decoction keep?
Refrigerated in a sealed jar it is fine for about 24 hours, though it loses aroma quickly. Never reheat it directly on a flame — add it to hot milk instead. Leaving it sitting in the filter for more than 45 minutes will make it harsh.
What grind size is South Indian filter coffee?
Finer than pour-over, coarser than espresso — roughly the texture of fine table salt, or a little coarser than moka pot grind. A burr grinder set fine, never a blade grinder.
Try it with fresh beans
Ground for the dabara, not for a V60.
Choose the South Indian filter grind at checkout. Roasted after you order, in New Delhi, with the roast date on the bag.