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1
Bring a large saucepan of salted water to a boil and add pasta squares.
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2
Stir well to prevent them from sticking together and cook for less than half a minute.
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3
Drain and transfer partially cooked pasta to a large bowl of ice water.
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4
Once cooled, transfer to damp kitchen towels and cover until ready to assemble the cannelloni.
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5
In a saute pan melt 4 tablespoons of the butter along with the olive oil and saute onion until softened, about 6 minutes.
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6
Add garlic and cook for 2 minutes longer.
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7
Transfer to a mixing bowl and add lobster, shrimp, crabmeat, and chopped herbs.
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8
Gently toss to combine.
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9
Preheat the oven to 375 degrees F.
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10
Assemble the cannelloni by placing a small amount of the filling in the center of each pasta square and roll up, cigar fashion.
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11
Repeat with the remaining cannelloni.
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12
Lightly oil a large casserole dish and arrange filled cannelloni, seam side up.
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13
Set aside while you make the sauce.
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14
In a small saucepan melt remaining 4 tablespoons of butter and whisk in flour.
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15
Cook for 2 minutes, stirring frequently.
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16
Add the milk and whisk to combine well.
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17
Bring to a boil, stirring frequently, and cook for 5 minutes, until very thick and the floury taste is gone.
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18
Season to taste with salt, pepper, and truffle oil.
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19
Pour sauce over top of cannelloni, sprinkle with grated cheese and bake in a preheated oven for 20 to 25 minutes, until heated through, bubbly and golden brown on top.
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20
In the bowl of a food processor, combine the flour, salt, and blanched spinach.
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21
Process to mix well.
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22
With the machine running, add the eggs, egg yolks and olive oil through the feed tube, and process until it resembles wet cornmeal, about 2 minutes.
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23
Take a handful of dough at a time and form into a firm ball.
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24
Repeat with the remaining dough.
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25
Roll out each dough ball into desired shape in a pasta machine according to the manufacturer's instructions.
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26
Bring a pot of salted water to the boil and cook the pasta until just al dente, about 2 minutes.
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27
Drain in a colander and serve with desired sauce.