How to choose and store tapioca (kappa)

By the Cochimart Kitchen Desk · Published 26 October 2026

Kappa in a Kerala kitchen: the short answer

Fresh tapioca, kappa (കപ്പ), should feel heavy and hard, have no soft or cracked patches, and show clean, white to creamy flesh with no dark streaks where it has been broken. It does not keep: a whole root starts to deteriorate within a day or two of being dug up. Buy only what you will use soon, keep it whole and unpeeled in a cool, shaded place until you need it, and if you have more than you can use, peel it, cut it into pieces and freeze it. Always peel and cook it fully before eating.

Kappa is one of the most familiar starchy roots in Kerala and turns up on every vegetable stall, so the real question is how to pick a good root and stop it spoiling on the kitchen floor. You will also find it on our vegetable names list, next to chena and chembu, the other roots sold at the same stalls.

The names you will hear

In Indian English the root is simply tapioca; most other countries call it cassava, and supermarkets in the Gulf, Europe and North America may label it cassava, yuca or manioc. The botanical name is Manihot esculenta. The plant is native to South America and became a staple in Kerala; a well-known story credits a Travancore ruler with spreading it after a famine, although it was already grown in the state before then. One point that confuses shoppers abroad: packets of "tapioca" in Western stores usually hold the starch or the pearls, not the fresh root.

Why fresh kappa spoils so fast

Unlike potatoes or onions, cassava roots are not built to rest after harvest. As soon as a root is dug up and cut from the plant, a process researchers call post-harvest physiological deterioration (PPD) begins, usually starting at the cut or broken ends. Over the next few days dark, bluish-black streaks spread through the white flesh along the root's vascular strands, and the root becomes unpleasant to eat. A study of cassava cultivars published in Plant Methods notes that because of PPD, roots cannot be kept in good condition for more than a few days after harvest.

An FAO handbook on cassava processing points out that roots for flour and starch are brought from the field as soon as possible after harvest and cannot be stored for more than two days. Commercial exporters get around it with wax coatings, plastic wrapping or freezing, and plant breeders are working on varieties that last longer. At home, the practical lesson is simple: treat fresh kappa like fresh fish, not like a sack of potatoes.

Because kappa is planted in batches and dug throughout the year, it is not a seasonal vegetable in Kerala; the Kerala season calendar lists it in every month. Freshness depends on when your root was dug, not on the month.

Choosing kappa at the stall

• Look at a broken end. Sellers often snap a root or cut off a tip so you can see inside. The flesh should be clean white or creamy, moist, and free of dark lines, blue-black dots or a grey ring under the skin. Streaks mean deterioration has already started.
• Press along the length. A good root is rock-hard from end to end. Soft spots, a spongy feel or sunken patches mean it is old or rotting inside.
• Check the skin. The thin brown outer skin should be intact and fairly dry. Earth stuck to it is fine; long splits, wet patches, white mould or a sour smell are not.
• Prefer whole roots. Every cut or break is a starting point for spoilage, so an unbroken root keeps a little longer than pieces chopped at the stall. If you buy cut pieces, plan to use them the same day.
• Pick a manageable size. Medium, fairly straight roots are easier to peel and cut than very large, twisted ones, and you waste less.
• Ask when it was dug. At a local stall this is a normal question. Kappa harvested that morning or the day before is ideal.

If you are writing a shopping list for someone else, our bilingual grocery list maker lets you add kappa with both its English and Malayalam names, so nobody comes home with sweet potato by mistake.

How to store tapioca

For a day or two: keep it whole

Leave the root whole and unpeeled, and do not wash it until you are ready to use it; damp skin encourages mould. Keep it in a cool, shaded, airy spot, away from direct sun and from the heat of the stove. Check it the next day by snapping off a small end piece: if the flesh is still clean and white, use it soon.

In the fridge: peeled pieces, briefly

For pieces you will cook tomorrow, peel, cut, wash and drain them, then keep them in a closed box in the fridge. Some households cover the pieces with clean water to slow browning and change the water once a day. Either way, use them within a day or two, and throw away anything that turns slimy, smells sour or develops dark patches.

For weeks: freeze it

Freezing is the most dependable home method for keeping kappa longer, and it is one of the methods used in the cassava trade. Peel the root completely, cut it into pieces of the size you normally use, pull out the woody central strand, wash the pieces and let them drain. Spread them on a tray so they do not stick together, or freeze them flat in a single layer in zip bags, then press out the air. Label the bag with the date and cook the pieces straight from frozen; thawing first makes them watery.

Dried kappa

Kerala's traditional answer to a glut was unakka kappa: roots peeled, sliced and dried hard in the sun. If you buy or are given dried kappa, keep it in a clean, airtight jar or tin in a dry cupboard, away from steam and moisture. Discard any batch that shows insects, a musty smell or mould. The same airtight, cool, dry approach works for tapioca pearls and starch, and for the spices covered in our spice storage guide.

Safety basics you should not skip

Cassava contains natural compounds called cyanogenic glycosides, which can release hydrogen cyanide. Food Standards Australia New Zealand advises that cassava is safe to eat when it is prepared properly, and requires it to be sold with a statement that it must be peeled and fully cooked before eating.

• Never eat it raw, not even a small piece.
• Peel both layers. The root has a thin brown outer skin and a thicker, pale inner rind under it. The FAO handbook describes the peel as the skin and the cortex together, with only the softer central part processed; at home, remove both.
• Know that types differ. Cassava is grown in sweeter and more bitter types. Both contain these compounds, but the bitter types contain much more, so buy roots sold for eating and cook them fully.
• Spoiled is spoiled. Freezing and drying do not rescue a root that was already streaked, soft or mouldy when you stored it.

Peeling and preparing it for storage

Cut off both ends first; the tips are often the woodiest part. Cut the root into short sections, then run a knife lengthwise through the skin and the rind until you reach the white flesh; the two layers usually lift off together in one strip. Wash the peeled pieces well to remove any earth from the skin.

Split thick pieces lengthwise and pull out the stringy central strand before storing; it does not soften well and is easier to remove raw. If you are working through other Kerala staples the same week, the coconut guide covers grated coconut, which goes off almost as quickly once opened, and our full list of ingredient guides collects the rest.

Sources and useful links

• Food Standards Australia New Zealand: Cassava and bamboo shoots
• FAO, Cassava processing (Plant Production and Protection Series No. 3), chapter 2: cassava flour and starch
• Zainuddin et al., Post-harvest physiological deterioration in cassava storage roots (Plant Methods, PMC)
• Ma et al., Vascular streaking and post-harvest deterioration in cassava roots (International Journal of Molecular Sciences, PubMed)
• Wikipedia: Cassava

Frequently asked questions