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Butternut Squash Soup with Gruyere Pesto

Updated February 23, 2016
This image courtesy of Joseph DeLeo

The generic recipe for winter squash soup or puree typically begins by calling for a scary amount of the squash “peeled, seeded, and cubed,” and then steamed or boiled. Have you ever tried to peel, let alone cut, even one of these hard winter squashes? There may be no easier way to cut yourself in the kitchen. And why bother boiling or steaming a vegetable, which makes it watery, when you can roast it and concentrate the flavor? My favorite way to cook winter squash is to cut it in half lengthwise, scoop out the seeds (or not they’re even easier to scoop out and discard after the squash is cooked), and bake it, cut side down, on a sheet pan in the oven. Now caramelized, it is delicious straight up. But puree it and add other ingredients and it can go anywhere. My Gruyère pesto isn’t really a classic pesto. I added some Gruyère to the standard recipe, left out the oil, and did not puree the mixture. But whatever you call it, my “pesto” adds a nice crunch and a fresh final touch. This is a satisfying soup that freezes well. You can concoct alternative versions of it by flavoring it with fresh ginger and lime or garnishing it with sautéed apple, crispy bacon, and Cheddar or with crumbled blue cheese and toasted walnuts.

Serves4 to 6

Cooking Methodbaking

CostInexpensive

Easy

Total Timeunder 4 hours

OccasionBuffet, Casual Dinner Party, Cooking for a date, Formal Dinner Party

Recipe Coursehot appetizer

Dietary Considerationegg-free, soy free

Equipmentblender, food processor

Mealdinner

Moodstressed

Taste and Texturecheesy, rich, sweet

Type of Dishhot soup

Ingredients

  • 2 medium butternut squash
  • 2 tablespoons unsalted butter
  • 2 medium leeks, white parts only, thinly sliced
  • 1 quart Chicken Stock, preferably homemade, plus more as needed for thinning
  • Kosher salt and freshly ground black pepper to taste
  • ¼ cup coarsely grated Gruyere cheese
  • 2 tablespoons toasted pine nuts, coarsely chopped
  • ¼ cup packed fresh basil leaves, shredded
  • 1 tablespoon freshly grated Parmigiano-Reggiano
  • Kosher salt and freshly ground black pepper to taste

Instructions

To prepare the soup, preheat the oven to 375°F. Halve the squash lengthwise, scoop out the seeds, and arrange cut side down on a lightly oiled baking sheet. Bake until very tender, 50 to 60 minutes. Cool to room temperature. When cool enough to handle, scrape out the pulp. You should have about 6 cups.

Heat the butter in a large soup pot or kettle over medium heat. Add the leeks and cook, stirring often, until softened, about 5 minutes. Add the squash and 1 quart of the chicken stock, increase the heat to high, and bring to a boil. Reduce the heat to medium-high and simmer, stirring often, until the leeks are tender, about 10 minutes. Working in batches, puree the soup in a food processor or blender until smooth. Thin with additional stock as needed to reach the desired consistency. Return to the soup pot and season with salt and pepper.

To prepare the pesto, combine the Gruyère, pine nuts, basil, Parmigiano-Reggiano, salt, and pepper in a small bowl. Keep at room temperature until ready to serve.

Serve the soup in warmed bowls. Garnish with a spoonful of the pesto just before serving.

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