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1
Preheat the oven to 450 degrees.
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2
Toss the zucchini with the olive oil and season to taste with salt and pepper.
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3
Line a baking sheet with parchment paper and top with the slices of zucchini.
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4
Place in the oven and roast 8 minutes.
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5
Remove from the oven, close the oven door and, using tongs, flip the zucchini slices over.
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6
Return to the oven for 5 minutes, or until the zucchini is tender when pierced with a knife and browned in spots.
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7
Remove from the oven and reduce the heat to 350 degrees.
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8
Steam the spinach for 2 to 3 minutes above an inch of boiling water, just until it wilts.
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9
Rinse briefly with cold water, squeeze out excess water and chop coarsely.
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10
Blend the ricotta cheese with the egg, water, cinnamon, salt and pepper.
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11
Set aside.
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12
Lightly oil a rectangular baking pan.
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13
Spread a small spoonful of tomato sauce to cover the bottom of the pan.
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14
Top with a layer of lasagna noodles.
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15
Top the noodles with a thin layer of ricotta, then a layer of zucchini and spinach, a layer of tomato sauce and a layer of Parmesan.
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16
Repeat the layers, ending with a layer of lasagna noodles topped with tomato sauce and Parmesan.
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17
Cover the baking dish tightly with foil and place in the oven.
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18
Bake 40 minutes, until the noodles are tender and the mixture is bubbling.
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19
Uncover and, if you wish, bake another 10 minutes, until the top begins to brown.
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20
Remove from the heat and allow to sit for 5 to 10 minutes before serving.