Jambalaya

Ingredients

• 1/4 cup olive oil
• 1 large red onion (finely chopped)
• 2 garlic cloves (finely chopped)
• 1/2 head celery (finely diced and leaves reserved for garnish)
• 1 red pepper (deseeded and chopped)
• 1/2 tsp chili powder (or to taste)
• 1 tsp ground cumin
• 1 1/4 cups long-grain rice
• 2 398ml cans chopped tomatoes
• 1 tbsp fresh thyme (or 1 teaspoon dried thyme, chopped)
• 10 1/2 oz skinned firm white fish fillet (cut into four pieces)
• 8 raw shrimp (peeled)
• 2 tbsp fresh flat-leaf parsley (chopped)
• 4 lemon wedges