What is the Gamasot?

The Gamasot (가마솥) is a large black cast-iron cauldron, set into a brick or stone hearth, heated with wood or charcoal. It has been the central tool in artisanal Korean tea production since the 7th century, when tea cultivation was introduced to the Korean peninsula.

Unlike a simple pan, the Gamasot is thick, heavy, with high thermal capacity that allows it to maintain a very stable temperature. Its slightly curved surface creates a homogeneous heat zone ideal for processing delicate leaves.

In the tea workshops of Boseong and Hadong, the Gamasot is heated to over 200 to 250°C for the first pass. Mastering the temperature is an art in itself: too hot, the leaves burn and become bitter. Not hot enough, oxidation is not stopped, and the tea loses its freshness. The artisan adjusts this parameter by hand, by touch, by eye, by smell.

Fixing the Beauty of Green: "Kill the Green"

As soon as the leaves are harvested, a race against time begins. Enzymes naturally present in the fresh leaf immediately begin to oxidize its contents on contact with air. If left unchecked, the leaf browns: this is the process that gives rise to black tea.

To obtain green tea, the artisan must stop this oxidation within a few hours, ideally within a few tens of minutes. This is what is known in tea jargon as "kill the green" (沙青, shāqīng in Chinese). The intense heat of the Gamasot denatures the oxidizing enzymes and preserves the color, vegetal aromas, and aromatic compounds of the fresh leaf.

Rolling: Sculpting the Aroma

After each firing, the artisan hand-rolls the leaves on a bamboo mat (멍석, meongsuk). This gesture, which requires years of learning, accomplishes two things simultaneously.

First, it structures the leaf. By rolling, the artisan gives the leaves their characteristic shape: twisted, compact, which will elegantly unfurl during infusion. This shape concentrates the aromas and slows their extraction, allowing for several successive infusions.

Next, it releases the essential oils. The pressure of rolling slightly breaks the cells of the leaf, releasing the volatile compounds responsible for the fragrance. It is this manual work that gives the wild teas and grand crus of Boseong their ability to be infused 4 to 7 times without losing their complexity.

The Kujung-Kupo: Nine Fires, Nine Rollings

The most demanding technique in artisanal Korean production is Kujung-Kupo (구증구포, literally "nine steamings, nine dryings"). For exceptional teas, the leaf passes alternately through the Gamasot and onto the rolling mat up to nine times.

Each cycle lasts approximately 30 to 45 minutes. Between the firings, the leaves cool and rest. This repetitive process, which can extend over an entire day for a few kilograms of tea, produces results impossible to achieve otherwise:

• Complete elimination of residual moisture without drying out the aromas
• Progressive development of hazelnut, roasted chestnut, and cereal notes
• Leaf structure allowing 6 to 9 successive infusions
• Total disappearance of bitterness associated with chlorophyll

Korean Gamasot vs. Japanese Steam: Two Philosophies

For a detailed comparison, see our article Korean green tea vs. Japanese green tea.

How to Honor This Work at Home

A tea produced with such care deserves careful preparation. Here's how to respect the Gamasot's work in your cup:

• 1Water: 65 to 75°C for Woojeon and Sejak (never boiling), 75 to 80°C for Joongjak and more robust teas. The dry heat of the Gamasot has already done its job: do not add bitterness with water that is too hot.
• 2Teapot: opt for a stoneware teapot that retains heat evenly, reminiscent of the Gamasot's cast iron. Porous ceramic slightly absorbs aromas and releases them with each infusion.
• 3Quantity: 3 to 5g of leaves per 150ml. Gamasot-processed leaves are concentrated: less is more.
• 4Successive infusions: do not discard the leaves after the first infusion. A quality Sejak can handle 4 to 5 passes. Slightly increase the temperature and time with each pass to extract new nuances.