Ganjang-gejang (Raw Blue Crab Cured in Soy Sauce)
Live blue crab cured — not cooked — in a soy brine that has been boiled and then chilled completely. The brine goes on cold and is re-boiled once after a couple of days, and only marine blue crab is used, never freshwater crab. Read the safety notes first.
Ingredients
- The crab
- Blue crab · 4–6 crabs, alive, marine only — never freshwater crab1 kg
- Soy brine
- Soy sauce (jin-ganjang)800 ml
- Water800 ml
- Rice wine100 ml
- Sugar · Part can be corn syrup100 g
- Aromatics for the brine
- Dried kelp (dasima) · In for 10 minutes only, then out — longer turns it slimy2 sheets
- Onion · Halved only1
- Spring onion1 large
- Garlic · Peeled, cloves whole1 head
- Ginger2 pieces
- Apple or pear · Sweetness and aroma0.5
- Dried chillies3
- Peppercorns1 tbsp
- Bay leaves2
- Added when packing
- Cheongyang chillies · Sliced on the diagonal4
- Lemon · Optional, thinly sliced0.5
- Sesame seeds · Scattered on serving
Steps
- ⏲ 2 min
Read the safety notes below first. Nothing here gets cooked, so the species and condition of the crab, the temperatures and the keeping time all come before flavour.
- ⏲ 20 min
Scrub the live crabs with a brush — between the legs and into the grooves of the shell — and pull off the triangular flap on the underside. Drain them well.
- ⏲ 60 min
Put the crabs in the freezer at -18°C or below for at least a day. The flesh firms up, which makes both handling and curing easier, and it is the more hygienic route — see Freezing and thawing.
- ⏲ 20 min
Boil the brine: soy sauce, water, rice wine and sugar with the onion, spring onion, garlic, ginger, apple, dried chillies, peppercorns and bay, for 20 minutes. Take the kelp out after 10 — it is the base of the savouriness but goes slimy if boiled long. See Building umami.
- ⏲ 120 min
Strain out the solids and chill the brine completely — into the fridge, not merely down to room temperature.
- ⏲ 2 min
Never pour hot or lukewarm brine over the crab. Hot brine half-cooks the meat and destroys its jelly-like texture, and time spent at lukewarm temperatures is exactly what lets bacteria grow.
- ⏲ 5 min
Pack the crabs into a container shell-side down. Inverted, the roe and innards stay inside them. Add the cheongyang chillies and lemon.
- ⏲ 5 min
Pour the cold brine over so the crabs are fully submerged, cover, and refrigerate. Weigh them down with a plate if they float.
- ⏲ 60 min
After 24 hours, pour the brine off and boil it again. Chill it completely and pour it back. This second boil tightens a brine that the crab has diluted and drives the salt evenly inward — see Salt and seasoning.
- ⏲ 60 min
Give it one more day refrigerated and it is ready. Days two and three are the best of it, and it should be eaten within five days.
- ⏲ 5 min
Cut the legs with scissors and halve the bodies. Scatter sesame seeds. The proper way to finish is rice pressed into the top shell and mixed with the roe and innards.
Tips & Variations
Making it safely
Nothing here is cooked, so this section is not optional.
- Use marine blue crab only. Never cure freshwater crab. Freshwater crabs and crayfish are intermediate hosts of the lung fluke (Paragonimus), and eating them uncooked risks infection. Blue crab is a saltwater species and does not carry that risk.
- Live crab only. Dead crab spoils very fast. If the legs hang limp or there is any ammonia smell, do not use it.
- The brine must be cold before it goes on. For hygiene as much as for texture.
- Refrigerated from start to finish. Do not create a window at room temperature.
- Eat it within five days. Longer is not advisable even refrigerated. To keep it, portion it and freeze.
- Some people should skip it entirely: anyone with liver disease or a weakened immune system, pregnant people, young children and the elderly. Raw crustaceans carry a risk of Vibrio infection, and for these groups the consequences are far more serious.
- Wash hands and utensils before and after handling the crab, and keep boards and other ingredients separate.
Variations
- Yangnyeom-gejang: the spicy version, raw crab tossed in a gochugaru sauce instead of brine — gochugaru, gochujang, garlic, sugar and fish sauce — and cured for about a day rather than two. Every safety note applies identically.
- Use females with roe: in spring (April–June), before spawning, the females are full of roe. The roe and innards are the point of the dish, so the season makes a real difference. In autumn, meatier males are used.
- Less salty: this is soy sauce and water 1:1. Take it to 700ml soy and 900ml water if that is too much — but salt is also doing preservation work, so a weaker brine keeps for less time.
- Flash-frozen crab: if you cannot get live crab, use crab flash-frozen on the boat. Thaw it slowly in the fridge.
- The same soy brine: jokbal is built on the same boiled soy, sugar and spice liquid — the difference is that jokbal simmers in it for hours while gejang is packed in it cold, which is the exact opposite. Using salt and time for preservation connects it to kimchi, and at the table something mild like gyeranjjim balances the saltiness.
Tips
- Boil the brine twice. Pour it off the next day, boil, chill and return it. The crab has released water and diluted it; this tightens it again and improves how long it keeps.
- Shell-side down. Inverted, the roe and innards stay in the crab. Packed the other way up they run out and all you get is a darker brine.
- Kelp for 10 minutes. The savouriness comes from it, but past 20 minutes it releases a slippery mucilage that spoils the texture of the brine.
- Keep them fully submerged. Anything above the surface discolours and spoils first. Weigh it down with a plate.
- Days two and three. At one day only the outside has taken the brine; past five it is just salty and the meat has gone soft.
- Boil the brine before reusing it. Once the crab is eaten, boil the remaining brine, cool it, and use it for braises. Never reuse it unboiled.
- Use scissors. Kitchen scissors are far easier than a knife and break up less of the meat.
- Rice in the shell. Warm rice and a few drops of sesame oil mixed into the roe left in the top shell is part of the dish.
The basics behind this dish
- Blanching: Keeping Vegetables GreenBlanched vegetables go dull because of acid and heat. Why the pot should be large, why the lid stays off, and what the ice bath is really for.
- Salt: When You Add It Matters More Than How MuchThe same amount of salt either draws water out or seasons all the way through, depending on when it goes in. Osmosis, seasoning in layers, and why salt types are not interchangeable by volume.
- Knife Skills: Grip, Cuts, and Why Size MattersHow you hold the knife matters more than how fast you cut. The pinch grip, the claw hand, and why uniform size is a cooking decision rather than a cosmetic one.
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