Poblano Pepper Soup

1 1/2 pounds fresh poblano chiles (8 large)
1/2 teaspoon coriander seeds
1 whole clove or 1/8 teaspoon ground cloves
4 whole allspice or 1/8 teaspoon ground allspice
1/4 cup mild olive oil
1 medium white onion, chopped (1 cup)
4 large garlic cloves, chopped
1/2 cup coarsely chopped cilantro
3 to 4 cups reduced-sodium chicken broth
1 cup heavy cream

Roast chiles:
Roast chiles on their sides on racks of gas burners, 1 or 2 per burner, on medium-high (or on rack of a broiler pan about 2 inches from heat), turning with tongs, until skins are blackened all over, 4 to 8 minutes. Transfer to a large bowl, then cover and let stand 20 minutes. Peel chiles, then stem, seed, devein, and coarsely chop.

Make soup:
Heat spices in oil in a large heavy saucepan over medium-low heat, stirring, until fragrant and oil begins to simmer, 1 to 2 minutes. Add onion and garlic and cook, stirring, until softened, 5 to 7 minutes. Add roasted chiles and 1 1/2 teaspoons salt and cook, stirring, 1 minute.

Purée chile mixture with cilantro and 3 cups broth (total) in 2 or 3 batches in a blender until smooth (use caution when blending hot liquids), about 2 minutes per batch.

Return mixture to cleaned saucepan and add cream. Bring to a simmer, adding more broth to thin if necessary, and season with salt.

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