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 The receipe I always use,, handed down by my pappy....

     Toss in crab' then pour on
    1 can of beer,
    6 oz of vinegar.
    Old bay seasoning.. 1/2  - 1 cup   your preference
    Pepper ...  ( several table spoons )
     Salt....   ( lots )
   ----------------
        Steam em for 20 minutes

The best and easiest recipe is to  drop your crab off at my place.  No muss no fuss.