Meanwhile, add the walnuts and sun-dried tomatoes to a
food processor and pulse 30 times, or until roughly minced and crumbly. Transfer to the stockpot along with the garlic, chili powder, smoked paprika, cumin, oregano, sea salt, and coriander. Decrease the heat to medium-low and sauté for 4 minutes, or until the spices are wafting a rich, toasted scent, stirring frequently.