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1
In large pot of boiling salted water, cook noodles until just tender, about 8 minutes for dried and 1 minute for fresh.
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2
Drain, and rinse under cold water.
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3
Spread noodles on clean kitchen towels, and cover with plastic wrap.
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4
In large skillet, heat 1 Tbs.
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5
oil over medium heat.
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6
Add garlic, and cook, stirring often, 30 seconds.
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7
Add chard, and cook, stirring often, until tender, about 5 minutes.
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8
Transfer chard to medium bowl, and stir in ricotta cheese.
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9
Season with salt and pepper.
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10
Set aside.
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11
Wipe out skillet, heat remaining 3 Tbs.
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12
oil over medium heat.
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13
Add onions, and cook, stirring, until onions begin to brown all over, about 15 minutes.
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14
Sprinkle with sugar and stir.
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15
Cook, stirring, until deep amber in color, about 20 minutes more.
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16
Remove from heat and splash with vinegar.
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17
Set aside.
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18
In medium saucepan, heat 2 1/2 cups milk over medium heat until steaming.
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19
Meanwhile, put flour in small bowl and whisk in remaining 1/2 cup milk until smooth; whisk into hot milk mixture and whisk constantly until sauce comes to a simmer and thickens.
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20
Continue cooking and stirring for 1 minute.
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21
Stir in Asiago or Parmesan cheese until melted and smooth.
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22
Season with salt and pepper.
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23
Preheat oven to 400F.
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24
Lightly oil a 9- x 13-inch baking dish or coat with nonstick cooking spray.
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25
Coat bottom of prepared dish with 1/2 cup of sauce.
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26
Line bottom with a single layer of noodles.
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27
Spread half the chard over the noodles.
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28
Add another layer of noodles, arrange caramelized onions on top, and sprinkle with salt and pepper.
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29
Spread another 1/2 cup sauce over all.
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30
Add another layer of noodles, followed by the remaining chard mixture.
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31
Finish with remaining noodles and sauce.
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32
Sprinkle with remaining Parmesan.
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33
Lightly oil a large piece of aluminum foil or coat with nonstick cooking spray and use it to tightly cover dish.
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34
Bake lasagna for 30 minutes.
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35
Uncover, and bake 10 to 15 minutes more, or until lightly browned and bubbling.
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36
Let stand for 10 minutes before serving.