Idli – fluffy steamed rice and lentil cakes Recipe
Idli are softly springy South Indian steamed cakes made from fermented white rice and urad lentils. This quantity yields about 16 standard idli when cooked in shallow cavities 6–7 cm wide, or in silicone cups filled with 40–45 ml batter each. White idli rice is the best choice; short- or medium-grain white rice also works. The listed 350 ml water is reserved for grinding and adjusting the batter—use additional water as needed for soaking, then discard it.
Idli are a breakfast staple across South India and are commonly served with coconut chutney and sambar. Their characteristic texture depends on the partnership between rice and urad dal. Hulled urad may look like other pale split pulses, but its ability to become light and mucilaginous when ground is distinctive and central to traditional idli batter.
Separate grinding gives each component the texture it needs: urad becomes an airy paste that traps fermentation gases, while the slightly grainy rice paste forms the tender structure of the cake. Steaming sets those bubbles without browning or drying the surface, producing idli with a moist crumb and many tiny, even holes.
Why this version works
- The 350 ml water is clearly assigned to grinding and batter adjustment, while the variable soaking water is drained away.
- Grinding rice and urad separately prevents the rice from becoming pasty before the lentils have developed enough aeration.
- A 27–30°C fermentation range, visible rise and a lightly tangy aroma provide more reliable guidance than time alone.
- A defined portion of 40–45 ml per shallow mold keeps the stated steaming time dependable and gives a yield of about 16 idli.
- Baking powder is treated only as a small rescue measure for weakly risen batter, not as a substitute for proper fermentation.
Chef's tips
Mark the batter level on the outside of the bowl before fermentation; even a modest rise is then easy to see. If using an oven light for warmth, check the temperature after 30 minutes because some enclosed ovens become hotter than the ideal fermentation range.
How to serve
Serve the idli warm, when their crumb is at its softest, with coconut chutney, sambar, or both. Arrange them in a covered serving dish if they must wait, as exposed idli cool and dry quickly.
Watch out for
- Do not replace urad lentils with generic white or yellow split lentils. They do not whip into the same airy paste and will produce denser, more fragile cakes.
- Avoid adding all the grinding water at once. A loose, runny batter cannot retain fermentation bubbles and may leave the idli flat or sticky.
- Keep the fermenting batter warm but not hot. Temperatures above about 35°C can encourage harsh sourness and weaken the batter.
- Do not use deep, nearly full muffin cups with the 10–12 minute timing; the outside may set while the center remains wet.
- Check that the boiling water stays below the steamer rack. Direct contact with water makes the bottoms heavy and gummy.
Substitutions
- White idli rice is preferred, but short- or medium-grain white rice can be used without changing the quantity. Very aromatic long-grain rice is less reliable for the desired soft texture.
- Hulled whole urad and hulled split urad are interchangeable here. Other white or yellow lentils are not suitable substitutes.
- Shallow silicone cups can replace an idli stand when each cup is limited to 40–45 ml batter and placed securely above the steaming water.
Ingredients
- white rice long-grain, rinsed - 250 g
- urid lentils white, hulled; you can use other small lentils - 100 g
- water for blending the batter, plus water for soaking - 350 ml
- salt - 0.75 teaspoon
- vegetable oil for greasing the molds - 1 tablespoon
- baking powder optional, if the fermentation was weak - 0.25 teaspoon
Preparation
- Rinse the rice and urad lentils separately until the runoff is nearly clear. Put them in separate bowls, cover with enough cold water to stand 3–4 cm above the grains, and soak for 4–8 hours. This soaking water is separate from the measured 350 ml used for grinding.
- Drain both bowls thoroughly and discard the soaking water. Leave the rice and lentils in their sieves for 10 minutes so excess water does not make the batter unpredictable. Measure the 350 ml grinding water into a jug.
- Blend the urad lentils first, adding 110–120 ml of the measured water gradually. Stop and scrape down the blender as needed, then continue until the paste is pale, smooth and visibly aerated. It should hold soft ridges rather than pour like milk.
- Blend the rice separately with 200–210 ml of the measured water. Aim for a thick paste with a faint fine-grained texture, similar to very fine semolina porridge. Reserve the remaining 20–40 ml water for the final adjustment.
- Combine both pastes in a bowl with at least three times the batter's volume. Mix vigorously for 1–2 minutes to distribute the urad batter and incorporate air. Add the reserved water only as needed: the finished batter should fall from a spoon in a broad, slow ribbon. Do not exceed the measured 350 ml.
- Cover the bowl loosely and ferment at 27–30°C for 8–12 hours. It is ready when it has risen by roughly one-third to one-half, shows bubbles along the sides and across the surface, and smells pleasantly tangy rather than sharply sour. In a cooler room, fermentation may take several hours longer.
- Sprinkle in the 3/4 teaspoon salt and fold gently without knocking out the trapped air. If the batter has risen by less than about one-quarter despite smelling fermented, fold in the 1/4 teaspoon baking powder as a backup; it helps lift the cakes but does not replace fermentation.
- Use the tablespoon of vegetable oil to coat the idli cavities lightly. Fill standard shallow molds 3/4 full, about 40–45 ml per cavity. When using silicone muffin cups, add the same quantity and keep the batter no deeper than 2 cm so the centers cook evenly.
- Pour about 3 cm water into a lidded pot and bring it to a steady boil. Set a rack or steamer insert above the water, making sure the molds cannot touch the surface. Arrange the filled molds on the rack, cover immediately and maintain a steady medium steam.
- Steam standard idli for 10–12 minutes without lifting the lid during the first 8 minutes. Silicone cups may need 12–14 minutes. The tops should look matte and feel springy, and a toothpick inserted in the center should come out without wet batter.
- Lift the molds from the pot and let the idli stand for 2–3 minutes. Run a thin knife or teaspoon around each edge and ease them out without compressing their soft centers.
Storage
Once cooled, you can store idli in an airtight container in the fridge; reheat briefly over steam or in the microwave covered with a little water until they are soft again.
I rely more on the batter's rounded, bubbly surface and gentle tang than on dramatic doubling. A well-fermented batter that has risen by one-third often steams into lighter idli than an over-fermented batter that has climbed high and turned sharply sour.
