Plain dosa, start to finish.

Part one · the batter

What goes in

Weigh everything dry, before soaking. A kitchen scale is the one tool this recipe will not work without.

Making the batter

Four stages. The first three take about 40 minutes of attention. The fourth is waiting.

1. Rinse and soak

   Rinse the rice in cold water three times, until the water runs clear rather than milky. Rinse the dal twice.

   Soak them in two separate bowls, water covering the grain by 5 cm. Put the fenugreek in with the dal.

   Soak time · 5 hours at 25–30 °C
   Below 20 °C · 7 hours
   Above 32 °C · 4 hours, or the dal turns slimy

   Ready whenA soaked grain of rice crushes flat under your thumbnail with no hard core. The dal has roughly doubled and feels soft all the way through.

2. Grind the dal first

   Drain the dal. Grind it with 150 ml of cold water added in three parts, never all at once. Dal ground alone and first is what makes the batter rise, so this is the step to be patient with.

   Wet grinder · 20–25 min, add water every 7 min
   Mixer grinder · 3 bursts of 90 s, 60 s rest between, ice water
   Batter temperature after grinding · under 30 °C

   Ready whenThe paste is white, smooth and visibly aerated, and has roughly doubled in volume. Drop a little into a glass of water: it should float, not sink.

3. Grind the rice

   Scrape the dal paste into a large vessel. Drain the rice and grind it with the remaining 175 ml of cold water.

   Rice does not need to be silk. A slight grit is what gives a plain dosa its crispness.

   Wet grinder · 25–30 min
   Mixer grinder · 4 bursts of 90 s
   Texture · like fine semolina between two fingers

4. Combine, salt, and ferment

   Add the rice batter to the dal. Mix with your clean hand for a full 2 minutes, lifting and folding rather than stirring flat. Add the 10 g of salt and mix again.

   Transfer to a vessel the batter fills no more than halfway. Rest the lid on top. Do not seal it.

   Consistency · falls off the ladle in a thick ribbon that holds its shape for a second
   Vessel · straight-sided, filled to 50% maximum
   Target rise · double the starting volume

   Kitchen temp	Time to double	Tip
   20 °C / 68 °F	22–26 h	Use an oven with the light on
   24 °C / 75 °F	15–18 h	Start it in the morning
   28 °C / 82 °F	10–12 h	Overnight
   32 °C / 90 °F	7–8 h	Check early
   36 °C / 97 °F	5–6 h	Refrigerate the moment it doubles

   Ready whenThe batter has doubled, the surface is domed and covered in small bubbles, and it smells sour and slightly sweet. Go by the rise, not the clock. A batter that has peaked and collapsed makes flat dosas.

   Keeps refrigerated · 4 days
   Stir once, gently, before the first use

   Kitchen colder than 20 °C? See fermenting in a cold kitchen.

Part two · the pan

Making the dosa

Heat is the whole game here. A cast iron tawa holds it best; non-stick works but browns less.

1. Bring the batter to pouring consistency

   Fermented batter is too thick to spread. Take out what you need, let it sit out of the fridge for 30 minutes, then thin it with water.

   Water · 40 ml per 500 g of batter, added a little at a time
   Consistency · coats the back of a ladle, runs off in a steady stream
   Stir gently. Beating it knocks out the air

2. Heat the tawa

   Heat it empty over medium-high until it reaches temperature. Take this seriously: an underheated pan makes the batter stick, an overheated one seizes it before you can spread it.

   Target surface · 200–215 °C (390–420 °F)
   Without a thermometer · a flicked drop of water skitters and vanishes in 2 seconds
   Too hot · the drop disappears instantly with a crack

3. Season the surface

   Halve an onion, dip the cut face in oil, and rub the whole surface of the tawa with it. Then wipe it back with a cloth until it looks almost dry.

   Sprinkle a tablespoon of water on the pan and wipe it off. This drops the surface into the pouring window and is why the first dosa usually fails without it.

   Surface at the moment you pour · 190–200 °C (375–390 °F)

4. Pour and spread

   Pour 80 ml, one ladle, into the centre. Put the base of the ladle on the batter and move outward in one continuous spiral, working from the middle to the edge.

   Spread in 10 to 15 seconds and then stop. Do not go back over a thin patch. The batter has already set there and you will tear it.

   Finished diameter · 22–25 cm
   Thickness · thin enough to see the pan through the edge

5. Oil and cook

   Drizzle 1 teaspoon of oil around the rim, not in the centre. The centre needs to dry out to go crisp.

   Cook on one side only. Do not flip a plain dosa.

   Cook time · 90–120 s
   Done when · edges lift on their own and curl, underside is evenly golden brown, top is dry with no wet sheen

   Removing itSlide a flat spatula under one edge, fold the dosa in half or roll it, and lift it off in one motion. If it resists, it needs another 15 seconds.

6. Reset between dosas

   Wipe the tawa with the oiled onion again, sprinkle and wipe water, and give it 20 to 30 seconds to come back to temperature. Stir the batter lightly before each pour, since the rice settles.

When it goes wrong

The four failures that account for almost everything.

• Batter never roseOld urad dal, or a kitchen under 20 °C. Check the dal first, then move the vessel somewhere warmer. Full diagnosis.
• Dosa sticks and tearsPan too cool, or not seasoned before the pour. Reheat to 200 °C and rub it with the oiled onion. More fixes.
• Batter seizes before you finish spreadingPan too hot. Sprinkle water, wipe, wait 20 seconds, then pour.
• Soft and pale, never crispsBatter too thick, or oil in the centre. Thin it, and oil only the rim.

More from the same kitchen

Dosas

• Masala dosaThe potato masala in grams, and when to fill and fold so the shell stays crisp.
• Ghee roast dosaThe same batter spread thinner and roasted slower in ghee until it snaps.
• Rava dosaThe instant one: no soaking or fermenting, and a watery batter poured from a height to make the holes.

From the same batter

• IdliThe same batter, not thinned, steamed for 10–12 minutes. What makes idli soft instead of dense.

Chutney and sambar

• Coconut chutneyFresh, frozen or desiccated coconut, in grams, with a tempering that takes 60 seconds.
• SambarTiffin sambar: toor dal, tamarind and shallots in grams, thinner than the sambar you eat with rice.

When it goes wrong

• Batter not fermentingThe seven causes, most likely first, with a test for each and a way to save the batch.
• Fermenting in cold weatherOven light, proof setting, Instant Pot or a cooler: the temperature each one holds and how long the batter takes.
• Dosa sticking to the panHeat, seasoning and batter checks, plus how to re-season a cast iron tawa that has stopped releasing.

Tools

• Batter calculatorHow many dosas, and how warm is your kitchen? Get every weight in grams and every wait in hours.
• Dosa equipmentScale, tawa, thermometer, grinder: what each recipe here assumes, and what to look for when buying.