Before You Start
Ordinary dosa has a hurdle that has nothing to do with technique, and it is planning. The traditional batter needs rice and urad dal soaked for hours and fermented overnight, so dinner has to be thought of the day before. Rava dosa avoids all that: semolina (rava) and rice flour are mixed with buttermilk or yogurt into a runny batter that rests only twenty to thirty minutes, hence its reputation as an instant dosa.
The technique is different too. A fermented dosa is made by putting a ladle of thick batter in the centre of the pan and spreading it outward in circles, but rava dosa batter is deliberately watery, and it is poured around the edge of the hot pan first and then toward the centre, which creates the open, lacy, uneven surface. It is harder to lift cleanly off the pan than a fermented dosa, and it depends more on a very hot pan and a gentle hand than on any practised ladle skill.
Where It Comes From
Rava dosa is a creation of 20th-century restaurants, not an old home dish, and the usual attribution is to the Udupi hotel tradition on the Karnataka coast, the same one that fixed the form of masala dosa and made it famous. The point was to offer something like a dosa without the wait that fermentation demands, so kitchens could make it to order swiftly. From the menus of South Indian restaurants, chiefly in Karnataka and Tamil Nadu, it passed into home cooking, and now tiffin menus across the country offer it plain, with onion and green chilli as onion rava dosa, or with vegetables mixed into the batter. Since it is a comparatively recent commercial dish and not an old regional one, there is less dispute about where it began than for older dosa styles, though the exact first version is not documented as precisely as the history of a single invented product normally would be.
How to Make It
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Prep
Whisk the flours into the buttermilk
Whisk the rice flour and all-purpose flour with the semolina in a large bowl, then add the buttermilk and roughly one cup of water, whisking steadily until no dry spots remain. The consistency should be plainly thinner than regular dosa batter, closer to single cream than to pancake batter.
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Prep
Let the batter stand
Let it stand for 20 to 30 minutes. This is not fermentation; the semolina just takes up liquid and swells, which affects both the crumb and the way the batter spreads and crisps. Without the wait, the dosa turns out gritty under its crisp rim and lacks tenderness.
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Prep
Season and thin out the batter
Mix in the cumin, cracked pepper, green chillies, ginger, curry leaves, coriander and salt, plus onion if you want it, and stir. Then pour in the remaining water slowly, stirring, until it slides from the back of a spoon in one continuous ribbon instead of falling in drops. This consistency matters more than any other factor for achieving a truly lacy dosa.
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Cook
Heat the griddle until it is very hot
Put the griddle over medium-high heat until drops of water sizzle and disappear in a second or two. Rava batter needs more heat than fermented batter, since nothing in it, neither tang nor fermentation, helps it firm up and crisp by itself.
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Cook
Pour from the rim toward the middle
Give the batter a stir before every dosa, since the flours settle quickly. Move fast: pour a thin ribbon starting at the rim of the hot griddle and wind it toward the middle, allowing the batter to fall into gaps and not smoothing it with a ladle. Leave the gaps; the holes are the whole point.
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Cook
Oil the surface and cook until lacy
Pour oil or ghee generously over the top and around the rim. Let the dosa cook untouched over medium-high heat for 2 to 3 minutes, until it is browned, crisp and full of holes, with the rim curling up and lifting off the pan on its own.
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Cook
Slide a thin spatula underneath
The open structure makes rava dosa more delicate than a regular one, so work a thin spatula under it bit by bit and avoid flipping it in a single motion. Most cooks do not flip it at all, and just cook one side until it is completely crisp.
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Serve
Fold it and bring it to the table
Fold it into quarters or a half-moon and bring it straight to the table with coconut chutney and sambar. Once it sits, a rava dosa loses its crunch faster than a fermented one does, so cook each to order and avoid plating them in advance.
Swaps That Work
Without buttermilk, loosen plain yogurt with water until it flows, or take water with a spoonful of lemon juice for a plainer, less sour result. A boxed rava dosa mix made by several South Indian brands is a fair shortcut and needs only water and seasoning. Carrot grated fine or very finely chopped capsicum can be added for a vegetable version, provided the pieces are small enough not to plug the thin batter as it flows through the gaps.
Turning the Heat Up or Down
The batter is mild by design and gets its flavour from cumin, pepper and curry leaves more than from chilli. For extra heat, use more green chilli and mix a pinch of red chilli powder into the batter, or dust a little over the oiled surface just before it sets. For a gentler dosa, leave out the green chilli and pepper and lean on cumin and curry leaves, serving a spicier chutney on the side so heat stays a choice at the table.
Where Cooks Go Wrong
A batter that is too thick is the usual problem, often because the cook measured the water cautiously out of instinct, expecting something like normal dosa batter; this one should look alarmingly thin before it meets the pan. A griddle that is not hot enough is another, because it stops the batter setting quickly and gives a pale, soggy dosa that tears when lifted. Pouring slowly, in a thick stream, fills the gaps and removes the lacy look the dish is known for. Lastly, if the batter goes unstirred, the flours settle, and the first and last dosas of a batch come out different.
Keeping and Warming Up Leftovers
To keep: You can refrigerate uncooked batter in a closed container for as long as 2 days. It thickens as it rests, so add water to thin it again and taste for seasoning, since chilling dulls salt and chilli. Unlike the usual dosa batter, this one neither ferments nor gets better as it ages, so there is nothing gained from making it earlier than needed. Cooked rava dosas neither keep nor hold up well, so make them fresh.
To warm up: Reheating a finished rava dosa is not worth the effort, since its lacy structure dries and turns leathery in a microwave, and a hot griddle mostly warms it without restoring crunch. Any leftover dosas are better put to other use: break them up and crisp them briefly in a pan with chutney powder for a quick snack, instead of reheating them like fresh ones.
Safe Handling
Keep the buttermilk or yogurt fresh and cold until it goes into the batter, especially in warm weather, since dairy that sits out for ages may sour in unpredictable ways, which hurts both safety and flavour. In a hot kitchen, put the mixed batter in the refrigerator for its rest and don't leave it out for the whole wait. At the stove, the main concern is the pan and the oil: avoid letting oil collect and smoke again and again on a hot griddle, and wipe and lightly re-oil between dosas so that burnt residue cannot build up and give a bitter, overheated taste to the next one.