Jalebi

Does the batter have to be fermented?

Traditionally yes, and the difference is real. Overnight fermentation produces carbon dioxide, which gives the hollow channels inside the spiral that hold syrup, and it produces acid, which gives the tang that stops a jalebi tasting like plain fried sugar. The instant version, using a pinch of baking soda or fruit salt whisked in just before frying, gives you the bubbles without the flavour. It fries perfectly well and it is what most home cooks do on a weekday, but a side by side comparison makes the case for the slow batter. Warmth matters more than time: in a cold kitchen twelve hours may do less than eight hours in a warm one.

What does one thread consistency mean, and why does it matter?

It is the stage where dissolved sugar has concentrated enough to be viscous but not yet enough to crystallise, around 106 to 112 degrees Celsius. Test it by letting a drop cool for a moment on a plate, then pressing it between thumb and forefinger and pulling them apart: a single short strand that holds briefly before snapping is the mark. Syrup thinner than this soaks straight through and turns the jalebi limp. Syrup thicker than this sets into a sugary shell on the outside and never penetrates, and it will eventually turn grainy in the pan.

Why is my jalebi soft instead of crisp?

Almost always because it sat too long in the syrup. Thirty to forty five seconds is the whole immersion, long enough for the syrup to fill the internal channels and no longer. Beyond that the fried structure softens all the way through and no reheating brings it back. The second cause is frying at too low a temperature, which lets the spiral absorb fat instead of setting quickly, so it comes out heavy and greasy before the syrup is even involved. Moderate steady heat and a short soak are the whole trick.

How hot should the syrup be when the jalebis go in?

Warm, and neither hot nor cold. Boiling syrup keeps cooking the jalebi and drives it soft, while cold syrup has thickened too far to enter the channels and simply coats the surface. Keeping the pan on the lowest possible flame throughout the frying session holds it in the right range. The lemon juice added at the end is not for flavour: a little acid converts some of the sucrose into invert sugar, which is what stops the syrup crystallising as it sits.

What goes wrong when the syrup crystallises?

Sugar comes out of solution and turns the syrup cloudy and gritty, usually because it was boiled past one thread, because stray crystals from the side of the pan fell back in, or because it was stirred once it came to the boil. Wiping the pan sides down with a wet brush and leaving the syrup alone once it boils prevents most of it. If it does crystallise, adding a few tablespoons of water and reheating gently dissolves it again. The same chemistry governs gulab jamun and rasgulla, though both of those want a thinner syrup than jalebi does.

Jalebi, imarti and jangiri

They look similar and are not the same. Jalebi is made from fermented wheat flour, piped as irregular spirals, and is thin and crisp. Imarti, sometimes called jangiri in the south, uses ground urad dal batter, is piped as a neat flower of loops, is thicker and softer, and is usually deep orange. Because imarti is pulse based rather than wheat based it is denser and chewier and holds far more syrup. Batter chemistry and the effect of frying on food structure are covered in the food science and FSSAI course, and where a festival sweet sits against a day's total intake is set out in how much sugar per day.