Peruvian Chicken Soup

Ingredients

• 1 small onion, pealed and quartered
• 1 rib celery, coarsely chopped
• 1 clove garlic
• Skin from a small jalapeño pepper
• 8 stems cilantro or flat-leaf parsley
• 2 cups chicken broth
• 1 tablespoon olive oil
• 1/4 cup dried quinoa
• 1 boneless, skinless chicken breast
• 1/2 cup frozen green peas
• Flaky sea salt
• Freshly ground black pepper