A couple of handfuls of rocket and/or spinach (optional)
Salt and black pepper to taste
Add olive oil, chopped onions, red pepper and garlic to an oven-proof pan and fry gently for 5 minutes to soften, stirring often.
Add the rice and fry gently for 1 minute, then stir in the stock and tinned tomatoes.
Stir in the tuna and season with salt and black pepper. Cover the pan.
Put in a preheated oven at 200 degrees C, 180 degrees fan, gas mark 6, for 20 minutes. Stir and add a little more liquid if necessary and cook for a further 10 minutes. Serve with the rocket and spinach if required.