Bring a large stockpot of water to a boil. Add the crab seasoning, vinegar, peppercorns, bay leaves, lemons, garlic and parsley to the pot. Add the crabs and boil until they are red, 10 to 12 minutes. Remove the crabs using a spider, and then let the crabs cool to the touch.
Crack the crabs over newspaper and pick out all their sweet meat. Serve with melted butter.