Big Batch Andouille Gumbo

Name: Big-Batch Andouille Gumbo
Ingredients: 1 cup vegetable oil; 1 1/2 pounds andouille sausage, cut into 1-inch pieces; 3/4 cup all-purpose flour; 2 medium onions, chopped; 3 green bell peppers, stemmed, seeded and chopped; 4 ribs celery, chopped; Kosher salt; 1 pound fresh or frozen okra, cut into 1/2-inch pieces; 10 cloves garlic, roughly chopped; 1 tablespoon fresh thyme leaves; 3 bay leaves; 1 teaspoon crushed red pepper flakes; 6 cups low-sodium chicken broth; One 28-ounce can whole peeled plum tomatoes, crushed by hand; 3 tablespoons apple cider vinegar; 1 bunch scallions, thinly sliced; 1/4 cup packed fresh parsley leaves, chopped; Steamed white rice, for serving