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1
Peel the pumpkin, then cut the flesh into slices 1/2-inch thick.
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2
In a heavy nonstick frying pan, heat 3 tablespoons oil over med-high heat.
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3
In batches, lightly saute the pumpkin slices in a single layer, turning once, until lightly browned and just tender, about 6 minutes.
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4
Do not crowd teh pan, or the slices may fall apart.
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5
Season with salt and pepper; transfer to a platter with a slotted spoon; set aside.
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6
Return the pan to medium heat and add the onion.
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7
Saute lightly, adding more oil if needed to prevent scorching, until the onion is softened, about 5 minutes.
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8
Add the garlic to taste and cook until fragrant, about 1 minute, then add the tomatoes and season to taste with salt, pepper, and a pinch of sugar.
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9
Continue to cook uncovered over medium heat, stirring occasionally with a wooden spoon, until the tomatoes break down and the mixture has form a saucelike consistency, 15-20 minutes.
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10
Stir in the rosemary and remove from the heat.
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11
Preheat the oven to 350u00b0.
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12
Arrange a layer of pumpkin slices in the bottom of an 13 x 9 inch baking dish (or 11 to 12-inch square baking dish) with 3 inch sides.
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13
Top with about 1/3 of the tomato sauce.
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14
Repeat, making 3 layers each of pumpkin and sauce and ending with a layer of sauce.
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15
Drizzle with the remaining 1 tablespoon olive oil.
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16
Bake until the top is lightly glazed and browned in spots and the pumpkin is tender when pierced with a knife, 35-45 minutes, checking it after about 25 minutes.
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17
Remove from the oven and serve hot or at room temperature.
