Pu-erh Shapes: Cake, Tuo, Brick and the 357 Gram Standard

Pu-erh is pressed into four main shapes: the flat cake, the small bird’s nest tuo, the brick and the mushroom. The standard cake is 357 grams, a figure that comes from the old seven-cake bundle of about 2.5 kilograms. The shape affects how the tea ages, how it is stored and how it is sold, and it is not only packaging.

Pressing is done by steaming the mao cha to soften it, weighing it, shaping it in a cloth bag and applying pressure. A stone press is traditional and slow; a hydraulic press is fast and gives a harder cake.

The four shapes

The flat cake, bing cha, is a disc about 20 centimetres across and 2 to 3 centimetres thick. It is the most common shape and the one the market prices. A 357 gram cake is the standard and 200 gram and 100 gram versions exist for households.

The tuo cha is a small bowl-shaped nest of five to ten grams, pressed in a mould. It was designed for a single serving and for transport, and it is the cheapest way to buy a genuine pu-erh.

The brick, zhuan cha, is rectangular and ranges from 100 grams to a kilogram. It is denser than a cake and ages more slowly, and it is used for coarse leaf and for the border trade.

The mushroom, jin cha, is a shape specific to the Tibetan trade, with a stem and a cap. It is rare now and mostly a collector’s form.

Why pressing is not just packaging

A pressed cake ages differently from loose leaf. The compression reduces the surface exposed to air, so the change is slower and more even, and the interior stays greener for longer than the outside.

A hard-pressed cake ages more slowly than a loosely pressed one, and a cake pressed too hard can have a centre that barely changes while the surface matures. That is why a good press is firm but not rigid.

The compression also protects the leaf. A cake travels without breaking, and a stack of cakes is a stable unit for storage.

Loose mao cha is sold and does age, and it changes faster because more surface is exposed. A drinker who wants fast results can buy loose; one who wants the traditional result buys a cake.

• The standard cake is 357 grams.
• Seven cakes make the traditional 2.5 kg bundle.
• Tuo cha is a five to ten gram nest for one serving.
• Bricks are denser and age more slowly.
• Hard pressing slows aging and can leave a green centre.
• Loose mao cha ages faster because more surface is exposed.

Breaking and storing a cake

Use a tea pick and work from the edge inward, following the layers rather than cutting across them. A cake breaks into leaves if the pick goes with the grain and into dust if it does not.

Break off enough for a week or two and keep the rest whole. A cake that is broken up entirely dries out faster and loses the benefit of the compression.

Store the whole cake in a dry, dark, ventilated place, and store the broken piece in a small tin. The two age at different rates, which is a reason to break only what will be drunk.

A drinker with limited space should buy tuo cha rather than cakes. They are small, they are cheap, and they give most of the character of a pressed tea without requiring a shelf.

How a cake is pressed

The mao cha is weighed, placed in a cloth bag and steamed for a few seconds until it is pliable. It is then shaped by hand into a rough disc and put into a mould.

A stone press is traditional: a heavy stone is placed on the mould and left for hours, which gives a firm but not rigid cake. A hydraulic press takes seconds and gives a harder one.

The pressed cake is removed from the mould and dried slowly, often in a warm room for days. A fast dry cracks the surface and a slow one gives a clean edge.

The cloth leaves a pattern on the face of the cake, and the pattern is one of the ways a buyer can tell a hand-pressed cake from a machine-pressed one. Neither is better and the difference is visible.

What the shape does to the cup

A cake and a tuo made from the same mao cha taste different, and the difference is extraction. A tuo is small and dense, so the leaf has to rehydrate through a short path and gives up its compounds quickly.

A cake is larger and the water reaches the centre slowly, which is why the first infusion from a cake is thinner than the first from a tuo of the same tea.

A brick is the densest of the shapes and extracts slowest of all. That is why bricks are usually made from coarse leaf, which needs the extra time and does not suffer from it.

The practical consequence is that brewing parameters should follow the shape as well as the tea. A tuo wants a shorter first steep and a brick wants a longer one, from the same leaf.

• A tuo extracts fast because the path is short.
• A cake’s first infusion is thinner than a tuo’s.
• A brick is densest and extracts slowest.
• Bricks are made from coarse leaf that needs the time.
• Match the steep to the shape, not only to the tea.
• Same leaf, different shape, different cup.

The seven-cake bundle and the 357 gram figure

A traditional bundle, a tong, holds seven cakes wrapped in bamboo leaf and bound with bamboo strips. Seven cakes of 357 grams come to about 2.5 kilograms, which was a convenient carrying weight for the caravan trade.

The 357 gram figure is therefore a consequence of the bundle rather than the other way round. A producer who wanted a round number would have chosen 350 or 360, and the odd figure is the trace of a transport requirement.

A tong is still the wholesale unit and it is still wrapped in bamboo. A buyer who wants a case of one tea buys a tong, and the bamboo wrapping is part of how the cakes age together.

That is why a tong of aged cakes is worth more per cake than the same cakes sold singly. The bundle aged as a mass, and the mass is the product.

• A tong is seven cakes wrapped in bamboo leaf.
• Seven 357 gram cakes come to about 2.5 kilograms.
• The weight was chosen for caravan transport.
• The 357 figure follows the bundle, not the reverse.
• A tong is still the wholesale unit.
• A tong of aged cakes is worth more per cake than singles.

Which shape to buy first

A tuo cha is the right first purchase. It costs little, it needs no pick, and it brews like a cake of the same tea.

A small cake is the second step, once the drinker knows they like the tea. It is the format the market prices and the one that ages in the familiar way.

A full 357 gram cake is a commitment and should come after both. A drinker who buys one first often ends up with a tea they do not like and cannot finish.

A brick or a mushroom is a collector’s or a specialist’s purchase. They are worth trying once and they are not the place to begin.

A final point about the trade-off between shape and convenience. A cake is the format the market values and the one that ages in the familiar way, and it is also the one that requires a pick and a shelf.

A tuo is the format for a drinker with limited space and a limited budget, and it gives most of the same tea with none of the storage demand.

Neither choice is a compromise on quality. It is a compromise between how the tea is stored and how it is drunk, and either answer is reasonable.

That is the whole of the shape question: four forms, one leaf, and a set of trade-offs between aging speed, storage demand and how much the market is willing to pay for the familiar disc.

Frequently asked questions