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1
Heat 1 tablespoon oil in large saucepan over medium-high heat.
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2
Add sausage; saute until browned, breaking up with fork, about 6 minutes.
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3
Add prosciutto; stir 1 minute.
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4
Transfer mixture to bowl.
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5
Heat 2 tablespoons oil in same pan over medium-high heat.
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6
Add onions and next 4 ingredients.
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7
Saute until tender, about 5 minutes.
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8
Stir in tomato paste.
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9
Add tomatoes with reserved juice, basil, and sausage mixture.
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10
Reduce heat; simmer until sauce thickens, stirring occasionally, about 15 minutes.
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11
Season with salt and pepper.
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12
(Can be made 1 day ahead.
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13
Cover and refrigerate.)
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14
Cook noodles in large pot of boiling salted water until just tender but still firm to bite.
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15
Drain.
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16
Arrange in single layer on baking sheet.
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17
Stir ricotta and 1 1/2 cups mozzarella in bowl.
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18
Season with salt and pepper; mix in egg.
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19
Brush 13x9x2-inch glass baking dish with oil.
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20
Spread 1 cup tomato sauce evenly over bottom.
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21
Arrange 3 noodles atop sauce.
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22
Spread 3/4 cup cheese mixture thinly over noodles.
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23
Spoon 1 1/2 cups sauce over.
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24
Repeat with noodles, cheese mixture, and sauce 2 more times.
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25
Cover with 3 noodles.
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26
Sprinkle with remaining 1/2 cup mozzarella.
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27
Cover with foil.
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28
(Can be prepared 1 day ahead.
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29
Chill.)
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30
Preheat oven to 350F.
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31
Bake lasagna, covered, 40 minutes.
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32
Uncover and bake until heated through, about 15 minutes longer.
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33
Let stand 10 minutes and serve.