Lamb and Winter Squash Soup

Name: Lamb and Winter Squash Soup
Ingredients: 1 pound boneless lamb shoulder, excess fat trimmed, cut into 2-inch pieces; Kosher salt; 1 dried guajillo or ancho chile; 1 medium onion, sliced into ½-inch-thick rounds; 4 garlic cloves, unpeeled; 2 tablespoons vegetable oil; 2 bay leaves; 2 allspice berries; 1½ teaspoons ground coriander; 1 teaspoon ground cumin; ½ teaspoon dried oregano; 1 small delicata squash (about 1 pound), seeds removed, sliced into ½-inch-thick rounds; Crumbled feta, cilantro sprigs, and lime wedges (for serving)