Chicken with Walnut Sauce (Katmis Satsivi)

Ingredients

• 3 cups toasted walnuts, plus 1/2 cup roughly chopped
• 5 cups chicken stock
• 1 1⁄2 cups roughly chopped cilantro
• 10 cloves garlic, finely chopped
• 1 large yellow onion, finely chopped
• 1 red Holland chile, stemmed, seeded, and finely chopped
• Kosher salt
• freshly ground black pepper
• 1⁄4 cup olive oil
• 2 lb. boneless, skinless chicken thighs, cut into 1 1/2" pieces
• 3 tsp. sweet paprika
• 1 tsp. hot paprika
• 1 tsp. ground coriander
• 1 tsp. ground fenugreek
• 1⁄2 tsp. ground cinnamon
• 2 egg yolks
• 2 tbsp. red wine vinegar