Make the bowls: Preheat the oven to 400 degrees F. Use a paring knife to cut a large circle around the stem of each pumpkin (make a zigzag cut, if desired). Remove the lid and scoop out the seeds and fibers. Sprinkle the inside of each with 1/2 teaspoon each sugar and salt. Place the pumpkins and lids on a baking sheet; roast until tender, 20 to 35 minutes, depending on their size.
Meanwhile, make the soup: Melt the butter in a large saucepan over low heat. Add the onion and 1 teaspoon salt. Strip the thyme leaves into the pot, increase the heat to medium and cook, stirring occasionally, until the onion is soft, about 5 minutes. Add the squash and sugar and cook, stirring, until glazed, 3 to 4 minutes. Add 5 cups water and bring to a boil. Reduce the heat to low and simmer, uncovered, until the squash is tender, 15 to 20 minutes.
Working in batches, transfer the soup to a blender, crack the lid to let steam escape and puree until smooth; return to the saucepan (or puree directly in the pan with an immersion blender). Stir in the heavy cream, if desired. Season with salt and pepper, and top as desired.
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Photograph by Steve Giralt
When blending hot liquid, first let it cool for five minutes or so, then transfer it to a blender, filling only halfway. Put the lid on, leaving one corner open. Cover the lid with a kitchen towel to catch splatters, and pulse until smooth.
Courtesy of Food Network Magazine
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