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1
For the porrata, rinse the leeks in several changes of cold water to remove all grit.
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2
In a small saucepan, combine the leeks, onion, butter and 1/2 cup water.
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3
Simmer, uncovered, until leeks are tender, about 25 minutes.
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4
Add the chickpeas and season with salt and pepper.
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5
Set aside.
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6
For the tuna and broth, combine the onions, carrot, celery, fennel, garlic and pepper in a large pot.
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7
Add 5 1/2 cups water.
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8
Boil, uncovered, for 40 minutes.
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9
Meanwhile, simmer the wine until it is reduced to about 1/4 cup.
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10
Strain the vegetable broth.
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11
Press the vegetables to force some pulp through the strainer into the broth.
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12
Add the reduced wine.
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13
There should be about 2 cups broth; if you have more, simmer it gently until reduced to 2 cups.
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14
Season lightly with salt.
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15
Preheat oven to 300 degrees.
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16
Spoon two heaping tablespoons of porrata into each of 6 individual ovenproof casserole dishes.
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17
Season the tuna well with salt and pepper and place a piece in each dish.
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18
Top each piece with 2 tablespoons of porrata and pour 1/4 cup of broth over each.
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19
Bake 25 to 30 minutes, until the tuna is medium to medium-well done, basting at least once.
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20
Meanwhile, mix together the bread crumbs, olive oil, lemon juice and truffles.
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21
When the tuna is done, top each portion with about 1/3 cup of the mixture and serve.