[header] How to prepare crabs [title] Bring several liters (8 to 9 cups) of water to boil to cook two crabs. [step] Season with two tablespoons of sea salt. [substeps] Allot at least 1 liter (0.3 us gal) for each crab that you are cooking. 
2 crabs would mean at least 2 liters (0.5 us gal) of water, while 5 crabs would mean at least 5 liters (1.3 us gal) of water. [title] Gently drop the crab (s) into the boiling water.