There’s an old saying “never send a boy to do a man’s job”, so if you’re serious about cooking crabs then follow this method. Boiling up a batch of crabs can give off a bit of an odour so this is definitely a job for the backyard, not the kitchen.
Submerge your catch in an ice slurry to start to ‘slow them down’ then immerse them in a large pot of boiling water for about 15 minutes, depending on size and quantity. From there it’s straight back into a fresh salt ice slurry. This will immediately cease the cooking process and cool the crab down ready to eat. Before you cook a crab you need to catch one first.