Cook the prawns in a pot of lightly salted boiling water until just cooked, about 2-3 minutes. Cool in cold water and then drain well. Peel the prawns, leaving the tip of the tail intact. Fill four tall glasses - full with ice. Pour in the vodka and add the Worcestershire, Tabasco and pepper. Pour in clamato juice. Garnish with a celery stalk and lemon wedge or slice. Hook two prawns on the rim each glass and serve.
Note: If desired the rim of the glass could be coated in celery salt. Dip the rim of the glass in cold water, and then in the salt. Finish the drink as described above.