Ingredients:

  Amount  Measure       Ingredient -- Preparation Method
--------  ------------  --------------------------------
   2      pounds        medium-size shrimp in shells
   1      tablespoon    seafood seasoning
   1                    lemon -- thinly sliced
  12      ounces        beer - -- (1 can)
                        === avocado sauce ===
     1/2  cup           lightly packed cilantro leaves
     1/4  cup           lightly packed flat-leaf parsley leaves
   2      tablespoons   extra virgin olive oil
   3      tablespoons   lime juice
   1                    avocado
     1/4  cup           mayonnaise
                        hot pepper sauce -- to taste
                        salt -- to taste
                        black pepper -- freshly ground, to
                        -- taste

Preparation:

Rinse shrimp; set aside. Add seasoning, lemon slices, and beer to about 1 quart of water in a Dutch oven. Bring to a boil, add shrimp and cook 1 minute. Drain and rinse with cold water. Place in a large plastic bag, seal, and refrigerate. Keep chilled until served. Make sauce and refrigerate. Peel shrimp as you eat them. For the sauce: Add cilantro, Parsley, olive oil, and lime juice to a blender or food processor fitted with the metal blade. Process until almost pureed. Peel and pit avocado; add to blender or processor. Process until smooth. Add mayonnaise; process just to blend. Pour into a bowl; season with hot pepper sauce, salt, and pepper. Cover and refrigerate. Keep chilled until served. This recipe serves 4 to 6.