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1
Position oven rack in center of oven; preheat oven to 350u00b0.
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2
Make the sauce: heat a large pan over medium heat, add in butter and olive oil; when butter has almost melted, add the onion; cook, stirring often, until translucent, about 3 minutes.
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3
Add in garlic; cook, stirring constantly, until aromatic, about 15 seconds.
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4
Pour in the tomatoes and their juice along with the peas and carrots; stir well and bring mixture to a simmer.
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5
Stir in the thyme, salt, pepper, and nutmeg; simmer just to blend the flavors and boil off a lot of the liquid, about 10 minutes.
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6
You don't want sauce as thick as ragu-more like a loose tomato sauce but beware of a watery sauce.
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7
Remove pan from heat and set aside.
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8
Cheese filling: whisk the ricotta, eggs, and lemon zest in a big bowl; do not beat-the ricotta should not turn watery.
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9
Prepare asparagus: trim off any beige or woody ends; shave off the outer skin to ensure that the spears will be tender after they are baked.
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10
If you asparagus is not pencil thin, shave down the spears with a vegetable peeler.
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11
Assemble the lasagna in a 13 x 9 inch baking pan as follows: 1 cup tomato sauce spread across the bottom of the pan; 3 no-boil noodles; 1 1/2 cups tomato sauce; half the cheese filling (use a rubber spatula to spread it evenly); half the asparagus spears (lay them tip to root in alternating directions); 3 more no-boil noodles; 1 1/2 cups tomato sauce, the remaining cheese filling, the remaining asparagus spears, the remaining noodles, and finally the remaining tomato sauce.
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12
Cover pan with a layer of parchment paper, then a layer of foil.
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13
Bake for 35 minutes, then uncover the pan and continue baking until bubbling and gooey, about 10 minutes.
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14
Let rest for 5-10 minutes before serving.
