Chicken-and-Sausage Gumbo

red onions, sliced

frozen cut okra, thawed

large yellow bell pepper, seeded and chopped

ribs celery with leaves, sliced

finely chopped, fresh flat-leaf parsley

garlic cloves, thinly sliced

bay leaves

salt

dried thyme

cayenne pepper

freshly ground black pepper

ground allspice

chicken thighs

cooked andouille sausage or kielbasa, sliced 1/2 inch thick

vegetable oil

all-purpose flour

chicken broth

tomato paste

(14 to 16 oz.) can whole peeled tomatoes, drained and chopped

minced scallion greens

distilled white vinegar, or to taste

cooked white rice