Step 1

Combine the stock and tomatoes in a large saucepan. Cover and bring to the boil over high heat. Reduce heat to medium. Uncover and simmer for 5 mins or until sauce thickens slightly.

Step 2

Add the fish and vegetable mix to the pan and return to a simmer. Reduce heat to low and cook for 5 mins or until the fish is just cooked through. Season.

Step 3

Divide the casserole among serving bowls. Sprinkle with basil.