medium onion, diced 1 large leek, white and light green parts only, halved lengthwise and thinly sliced • celery, thinly sliced 1 teaspoon kosher salt 3 cloves garlic, chopped 1 teaspoon turmeric 1 teaspoon poultry seasoning 6 cups chicken broth 1 13.5 ounce can coconut milk • chopped fresh parsley 1 teaspoon kosher salt, or to taste 1/2 teaspoon black pepper • large onion • boneless skinless chicken thighs or breasts 1 10 ounce bag frozen peas (optional)