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1
Toast pumpkin seeds in a dry heavy pan over medium heat, stirring constantly, until browned and popping. Cool completely, then grind to a fine powder in a spice grinder.
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2
Toast chile seeds in the same dry pan until fragrant. Transfer to a blender with a small amount of the broth, the clove, allspice, and charred garlic. Blend until smooth.
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3
Combine the blended chile mixture with the ground pumpkin seed powder and the remaining broth in a saucepan. Add the epazote stem. Simmer over medium-low heat for approximately 8 minutes, stirring regularly.
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4
Remove the epazote. Strain the soup through a fine-mesh sieve, pressing the solids. Return the strained liquid to the pan.
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5
Cook over medium heat, stirring, until the soup thickens slightly. Adjust salt.
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6
Divide the warmed shredded chicken between four bowls. Ladle the hot soup over the chicken. Finish with crumbled chile piquín at the table.