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1
Make slits in turkey with tip of small sharp knife; put 1 anchovy piece and 1 garlic sliver into each slit.
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2
Place turkey in large saucepan or Dutch oven.
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3
Add all remaining ingredients.
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4
Add water to cover.
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5
Bring to boil.
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6
Reduce heat, cover partially and simmer until meat thermometer inserted in center of turkey registers 140F, about 1 hour.
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7
Turn off heat and let turkey cool in cooking liquid.
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8
Puree tuna, anchovies, lemon juice and 3 tablespoons capers in processor until very smooth, scraping down sides of work bowl occasionally.
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9
With machine running, gradually mix in oil and blend until creamy.
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10
Add mayonnaise and just blend using on/off turns (do not overmix).
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11
Remove turkey from broth (reserve broth for another use).
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12
Cut off string and pull off turkey skin.
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13
Slice turkey into thin rounds.
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14
Coat platter with some of sauce.
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15
Top with single layer of turkey slices.
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16
Spread turkey with more sauce.
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17
Sprinkle generously with parsley and capers.
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18
Continue layering turkey, sauce, parsley and capers until all of turkey is used.
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19
Surround with lemon slices.
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20
Cover with plastic; chill turkey and any remaining sauce separately for at least 8 hours.
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21
(Can be prepared 2 days ahead.)
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22
Let turkey stand at room temperature 1 hour.
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23
Serve, passing any remaining sauce separately.