Gordon Ramsay takes on Louisianian gumbo

Name: Gordon Ramsay takes on Louisianian gumbo
Cuisine: American
Ingredients: For the braised chicken; 4 boneless, skin-on chicken breasts; 4 bone-in, skin-on chicken legs, thighs attached; 1 tsp freshly ground black pepper; 2½ tsp kosher salt, divided; 2 tbsp grapeseed oil; 4 garlic cloves, crushed; 3 celery stalks, diced; 2 yellow onions, diced; 8 cups chicken stock; 3 sprigs thyme; 3 spring onions, trimmed and chopped; 1 lemon, cut in half, seeds removed; 227g andouille sausage, cut into 1.3cm-thick slices; 108g unsalted butter; 125g all-purpose flour; 2 celery stalks, finely diced; 2 garlic cloves, minced; 1 red bell pepper, finely diced; 1 green bell pepper, finely diced; 1 yellow onion, finely diced; 1 tsp kosher salt; 1 tsp cayenne pepper; ½ tsp freshly ground black pepper; 2 tbsp hot sauce; For the rice; 341g white rice; 946ml water; 2 sprigs thyme, picked; 2 tsp kosher salt