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1
Using kitchen scissors, cut through lobster shells; carefully remove lobster and chop. In a small skillet, combine the lobster, cream, thyme, 1/4 teaspoon salt and 1/8 teaspoon pepper. Bring to a boil over medium heat; cook 3-5 minutes or until lobster is firm and opaque. Discard thyme sprigs. Stir in bread crumbs; set aside to cool.
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2
Make a lengthwise slit down the center of tenderloin to within 1/2 in. of bottom. Open meat so it lies flat. Place lobster mixture down the center. Close tenderloin; tie several times with kitchen string. Sprinkle with remaining salt and pepper.
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3
Place the tenderloin in a greased 15x10x1-in. baking pan; fold ends under tenderloin. Bake, uncovered, at 475u00b0 for 20-25 minutes or until browned. Cool to room temperature; refrigerate until chilled.
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4
On a lightly floured surface, unfold one puff pastry sheet; cut lengthwise along one fold line, forming two rectangles. Cut smaller rectangle into a 6x3-in. rectangle; use remaining piece for decorations if desired. Moisten a 6-in. edge of large rectangle with water. Attach smaller rectangle along that edge, pressing lightly to seal. Roll out 2 in. longer than the tenderloin on each side. Transfer to an ungreased
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5
. Brush with egg white.
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6
Remove and discard kitchen string from tenderloin; place onto the pastry. Roll out remaining puff pastry into a rectangle 8 in. wide and 5 in. longer than the tenderloin; place over the meat. Brush pastry edges with water; fold edges under meat. With a sharp knife, make four slashes across top of pastry. Brush with butter.
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7
Bake, uncovered, at 425u00b0 for 40 minutes (meat will be cooked to medium doneness); cover loosely with foil to prevent overbrowning if necessary. Transfer to a serving platter. Let stand for 15 minutes before slicing.
