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1
Heat the EVOO in a saucepot and add the butter.
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2
Add the garlic and cook, stirring, for 2 minutes.
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3
Add the tomatoes and crush them up a bit.
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4
Add the passata, a fat handful of torn basil leaves, the onion and some salt and pepper.
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5
Bring to a simmer and simmer for 40 to 45 minutes.
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6
Remove the onion and set the sauce aside.
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7
Separate the spinach while adding it to a mixing bowl.
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8
Add half of the mozzarella, the ricotta, 1 1/2 cups of the Parmigiano-Reggiano and the eggs yolks and mix to combine.
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9
Season with grated nutmeg, salt and pepper.
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10
Layer a little sauce into a lasagna pan and top with three flat lasagna sheets or four curly.
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11
Top with a little more sauce, and then half of the spinach and cheese mixture.
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12
Repeat with another layer, and end on top with lasagna sheets.
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13
Top with some sauce and the remaining mozzarella and Parmigiano-Reggiano.
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14
The lasagna can be stored before or after baking for a make-ahead meal, or baked to serve immediately.
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15
When baking the first time, bake at 375 degrees F, uncovered, from room temperature until cooked through and brown and bubbling on top, 60 to 70 minutes.
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16
If reheating, bake at 375 degrees F, covered, for 40 to 45 minutes.
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17
Let the lasagna rest 20 minutes before cutting.
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18
Serve with extra sauce on the side.