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1
Preheat the oven to 375 degrees F.
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2
Bring a few inches water to a boil in a large pot and add salt.
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3
Cook the escarole for 5 minutes, then drain.
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4
Cover the garlic cloves with water in a saucepan and simmer for 20 minutes.
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5
Drain and let cool.
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6
Squish the garlic pulp from the jackets into a bowl and mash with a fork.
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7
Meanwhile, melt 3 tablespoons butter in a medium saucepan over medium heat.
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8
Add the sage and stir.
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9
Add the squash, stir and season with salt and pepper.
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10
Add the chicken stock and cook, stirring occasionally, for 15 minutes.
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11
All the stock should be absorbed and the squash should be lightly browned and tender.
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12
Remove from the heat.
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13
Melt the remaining 3 tablespoons butter in another medium saucepan over medium heat.
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14
Add the flour and whisk for 1 minute.
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15
Whisk in the milk and mashed garlic and season with salt, pepper and a little nutmeg.
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16
Cook until slightly thickened (the sauce should just coat the back of the spoon evenly without breaking up on the spoon's surface).
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17
Whisk together the pumpkin puree, 2 eggs and some salt and pepper in a small bowl.
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18
In another bowl, whisk together the ricotta, half the Parmigiano-Reggiano and the remaining egg.
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19
Preheat the oven to 375 degrees F. Soak the lasagna sheets in water for 5 minutes.
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20
Pour about half the garlic sauce into the bottom of a 9 by 11-inch baking dish.
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21
Add a layer of lasagna sheets and then half the pumpkin mixture.
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22
Make another layer of lasagna sheets and spread with all of the ricotta mixture, followed by the squash and then escarole.
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23
Top with half the Fontina, another layer of lasagna sheets, the remaining pumpkin and another layer of lasagna sheets.
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24
Finish with the remaining garlic sauce and sprinkle with the remaining Parmigiano-Reggiano and Fontina.
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25
Bake the lasagna, covered, for 45 minutes.
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26
Raise the oven temperature to 400 degrees F and continue to bake, uncovered, for 15 minutes more.
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27
Let rest for 15 minutes, then cut and serve.