Avocados Stuffed With Lobster
["3 ripe avocados", "3 Tbsp. lemon juice", "1 Tbsp. butter", "2 Tbsp. flour", "1 c. light cream (half and half)", "3 Tbsp. sherry", "1/2 tsp. salt", "dash of pepper", "3 c. cooked lobster (or frozen crab substitute), flaked", "1/2 c. (about 3 oz.) crumbled Bleu cheese"]
["Cut avocados in half lengthwise and remove seed.", "Bruise slightly and sprinkle with lemon juice.", "Don't peel."]
["avocados", "lemon juice", "butter", "flour", "light cream", "sherry", "salt", "pepper", "lobster", "cheese"]