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1
Bring a large pot of water to a boil; season with salt. Add lasagna sheets and cook until pliable and al dente, 1 to 2 minutes. Drain, and rinse under cold water.
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2
Preheat oven to 450 degrees.
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3
Pour 1 cup sauce into a shallow baking dish; set aside.
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4
Cut two sheets in half lengthwise to make four 2-by-8-inch sheets; set aside.
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5
Spread 1 cup sauce on the bottom of a 13-by-9-inch baking dish.
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6
Dip half of a reserved cut sheet crosswise in the reserved sauce, and drape over a corner of the baking pan, leaving the sauce-covered end in the pan with the other half hanging over the edge.
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7
Repeat with remaining 3 cut sheets and corners.
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8
Line edges of pan in the same manner using full-size sheets dipped lengthwise.
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9
Finish lining the bottom of the pan with 2 full sheets.
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10
In a medium bowl, toss to combine meatballs with 1/3 cup pecorino Romano, and 1/4 cup basil; spread evenly in bottom of dish.
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11
Pour over 1 cup sauce, and cover with 2 lasagna sheets.
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12
In the same bowl, toss sausages with 1/3 cup pecorino Romano; spread evenly in baking dish.
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13
Pour over 1 cup sauce, and cover with 2 lasagna sheets.
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14
In a medium bowl, combine mozzarella with 1/3 cup pecorino Romano; spread evenly in baking dish.
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15
Pour over 1 cup sauce, and cover with 2 lasagna sheets.
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16
In a medium bowl, combine remaining 1/3 cup pecorino Romano with ricotta and egg; spread evenly in baking dish.
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17
Top with 1 cup sauce.
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18
Center pasta sheets on ricotta within 1/2-inch of the edge of dish. Brush draped lasagna with sauce, and fold over to seal and enclose.
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19
Cover lasagna with a clean, damp kitchen towel.
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20
Double-wrap baking dish in aluminum foil.
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21
Place an ovenproof plate, upside down, in a large roasting pan; fill pan with 2 inches of hot water.
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22
Place lasagna on top of plate. Bake until lasagna reaches an internal temperature of 160 degrees to 170 degrees on an instant-read thermometer, 1 1/2 hours to 1 hour 40 minutes.
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23
Remove from oven; let stand 15 minutes before serving.
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24
Garnish with remaining basil, and serve with remaining sauce, if desired.