Storing tofu

Unopened blocks

Water-packed tofu from the refrigerated case keeps until its printed date, typically several weeks out, and it is generally fine for a short period beyond that if the package is intact and cold. Trust your senses over the date, in both directions.

Shelf-stable tofu in aseptic cartons is a different product. It sits at room temperature for months and goes into the refrigerator only once opened. It is usually silken, so check before assuming you can crisp it. The types guide covers what the labels mean.

Vacuum-packed super-firm tofu keeps like the water-packed kind and has the advantage of arriving already pressed.

A swollen or leaking package goes in the bin without further investigation.

Opened blocks

Once opened, an unused portion needs to go into a container, be covered completely with fresh cold water, and go back into the refrigerator. The water is not optional. Tofu left uncovered dries at the surface, takes on refrigerator smells, and spoils faster.

Change the water daily. This is the step almost everyone skips and it makes a real difference to how long the block stays good.

Handled that way, an opened block generally keeps three to five days. Without the water change, treat it as two or three.

Cooked tofu is stored the opposite way, dry and sealed, with no water anywhere near it. Three to four days, and cool it fully before sealing so condensation does not soften the crust overnight.

How to tell it has turned

Spoiled tofu is not subtle, which is genuinely reassuring for anyone nervous about it.

• Smell. Fresh tofu smells faintly of beans or of nothing at all. Turned tofu smells sour or sharp, and you will notice on opening the container without having to lean in.
• Color. Fresh is white to very slightly cream. Any distinct yellowing, darkening in patches, or discoloration means it goes.
• Surface. A slippery or slimy film is a clear stop signal.
• Water. Cloudy, thick or bubbling storage water is a sign, even if the block looks acceptable.
• Anything fuzzy. Obvious, but worth stating: no cutting around mold on a soft moist food.

One exception worth knowing. Frozen and thawed tofu turns tan or pale yellow and takes on a spongy texture, and that is the freezing working exactly as intended rather than spoilage. The freezing guide explains why the color changes.

The freezer

Tofu freezes well and comes out of the freezer better than it went in, which is unusual for any food. Ice crystals push the protein structure apart, and the thawed block is chewier, more porous, and far better at taking up marinade.

Blocks keep several months frozen. In the unopened package works but takes up more room and thaws slowly, since all the packing water freezes too. Drained and sealed in a bag is faster on both ends and stacks flat.

Thaw overnight in the refrigerator, or in a sealed bag under cool running water in about an hour. Then squeeze the block firmly over the sink until water stops running freely. That squeeze is what makes the technique work and it is the step people miss.

Do not refreeze a thawed block. Freezing it a second time after thawing does change the texture further, and some people like the result, but it should be a deliberate choice made with a block that has stayed cold throughout rather than an afterthought.

A routine that removes the planning problem

Tofu is usually cheaper in multipacks and the packs are usually more tofu than one meal needs. The habit that solves both problems: buy three or four blocks, put two straight into the freezer, and move one frozen block into the refrigerator every time you cook a fresh one.

There is then always a thawed block ready for a recipe that wants the chewier texture, and always a fresh one for a recipe that wants crisp cubes. Nothing sits in a drawer going sour.

Recipes that specifically benefit from a frozen block are barbecue tofu and, optionally, smoky paprika tofu.

Containers and the storage water

Use a container that lets the block sit fully submerged rather than one that squashes it against a lid. Glass is easier to see through, which matters because cloudy water is one of the earliest signs a block is going, and you want to notice it without opening anything.

Plain cold tap water is fine. Salting the water is sometimes suggested and it does slow spoilage slightly, though it also seasons the surface of the block, which may or may not suit what you plan to cook. If you salt it, use a light pinch rather than a brine.

Do not store tofu in the water it came in. That water has been sitting against the block since the factory and is the first thing to go off. Drain it, rinse the block, and cover it with fresh water.

Storing cooked tofu well

Cool completely on the pan or a rack before it goes into a container. Sealing warm tofu traps steam, and by morning a crust you spent twenty minutes building has gone soft.

Store it dry and undressed where possible. Sauced tofu keeps as long but loses its texture faster, so if you are cooking deliberately for the week, cook a plain batch by the basic method and sauce portions as you eat them.

Reheat in a hot dry pan for two minutes, in an air fryer at 375F for four, or in a 400F oven for six to eight. A microwave heats it through and destroys every crisp edge, which is fine if it is going into something saucy and not otherwise.

Roasted and paprika-style tofu are both good cold straight from the container, which is unusual for a cooked protein and a large part of why batch cooking tofu is worth doing.