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1
Bring the sauce to room temperature.
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2
In a large bowl, whisk the ricotta, egg yolks, Parmesan, 1 1/2 teaspoons salt, black pepper, nutmeg, and cayenne pepper.
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3
Chill the filling until ready to assemble the lasagne.
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4
Preheat the oven to 400F.
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5
Butter an 11 x 14 x 3-inch lasagne baking pan.
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6
Bring a large pot of water to a boil.
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7
Add the olive oil and the remaining tablespoon salt.
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8
One at a time, add the lasagne noodles; cook until al dente, 2 to 3 minutes less than the manufacturers instructions.
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9
Remove the noodles with tongs; drain in a colander.
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10
Spread about 3 cups sauce on the bottom of the baking dish.
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11
Place a single layer of lasagne noodles over the sauce, overlapping them slightly.
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12
Spread about 2 cups sauce over the noodles and about half of the ricotta filling mixture over the sauce.
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13
Top with a layer of lasagne noodles, again slightly overlapping them.
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14
Repeat with more sauce and the remaining ricotta filling mixture.
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15
Top with a final layer of lasagne noodles.
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16
Spread a layer of sauce over the noodles, and finish with a layer of sliced mozzarella rounds.
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17
Bake until the sauce is bubbling and the cheese is melted, at least 1 hour.
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18
Cover with aluminum foil if the cheese starts to brown too early.
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19
Let the lasagne stand 10 to 15 minutes before serving.
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20
Heat the butter and olive oil in a large cast-iron or enamel pot over medium heat.
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21
Add the onions, and cook until they begin to soften, about 5 minutes.
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22
Add the celery and carrots, and cook until the vegetables are tender, 8 to 10 minutes.
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23
Add the ground sirloin and veal, and cook, stirring occasionally, until the meat is no longer pink.
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24
Add the milk, and cook at a gentle simmer, skimming fat from surface, until the liquid has reduced by half, about 50 minutes.
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25
Add the wine, and simmer until liquid is reduced by half again, about 40 minutes.
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26
Add the beef stock, tomato paste, salt, and pepper; simmer gently until the sauce thickens, 40 to 45 minutes.
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27
If using for lasagne, set aside to cool slightly before assembling.
