in a large pot, bring the beer,water, creole seasoning, salt,peppercorns, and the juiced lemon halves to a boil. allow the mixture to boil, covered, ten minutes. in the meantime, melt the butter in a small saucepan and add the lemon juice. add the shrimp to the pot boiling beer, cover, and turn off heat. check the shrimp after 3 minutes for pink color throughout; with a slotted spoon, remove the shrimp and transfer them to serving bowls. add 1/3 cup boiling beer liquid to the butter and simmer 2 minutes. serve the warm shrimp with the butter dipping sauce on the side.