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1
Prep vegetables: in a big bowl, combine the eggplant, zucchini, peppers, onions, garlic, rosemary, 1/2 cup basil, salt, pepper, and 1/2 cup olive oil; marinate for 2-3 hours at room temperature.
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2
Make the sauce: scald milk in a medium saucepan (look for small bubbles forming around the edge) over low heat for about 4 minutes.
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3
Remove pan from heat, but keep warm.
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4
In another medium saucepan, melt the butter over medium heat until completely melted.
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5
Whisk in the flour and let the mixture foam and cook, whisking occasionally, for 3 minutes or until it is a light tan color (you will notice a nutty aroma to the mixture).
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6
Slow whisk in the hot milk and cook, whisking constantly, until the sauce thickens, about 5 minutes.
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7
If the milk has cooled, add it gradually in small portions, whisking between each addition to prevent lumps.
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8
If the sauce isn't thickening, increase the heat slightly and whisk constantly so as not to burn the sauce.
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9
Season sauce with salt to taste and remove from the heat; cool before using in the lasagna dish.
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10
Make the lasagna: preheat oven to 375u00b0.
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11
Remove the vegetables from the marinade to a deep roasting pan; roast in the oven until tender and browned, about 30 minutes, stirring twice during roasting time.
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12
In a skillet, heat 2 tablespoons olive oil; add in the mushrooms and saute over medium heat for 3 minutes; add in the baby spinach, sauteing until wilted and tender; set aside.
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13
In a big pot of boiling, salted water, cook the lasagna noodles until al dente; drain and rinse with cold water; dry on a towel.
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14
Assemble: pour 1 cup of Bechamel sauce over the bottom of an oiled 13 x 9 inch baking dish and arrange 1/4 of the roasted vegetable mixture on top.
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15
Cover with pasta, then top with 1/4 more of vegetable mixture, add some mushrooms, some diced tomatoes, 1/2 cup Becamel sauce, some of the remaining basil, and 1/2 cup Parmesan cheese.
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16
Repeat the procedure two times, ending with Parmesan cheese and 1/2 cup Bechamel sauce.
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17
Cover with foil and bake for 10 minutes until the lasagna is bubbling and golden brown.
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18
Remove from the oven and let rest 10 minutes before cutting to serve.