Place a large frying pan on a medium heat and add the olive oil. While the pan heats up peel and finely slice the onion then add it to the pan.
Fry the onions for 2-3 minutes, until they begin to soften. While the onions cook wash, deseed and slice the pepper, add to the pan and fry for a further 3-4 minutes.
Add the paella rice and mix through the onions and peppers. Pour half the stock into the pan and bring to the boil then reduce the heat and simmer.
Wash and slice the leek into ½ inch slices and add to the simmering paella. Cover the pan stirring from time to time, when the rice begins to look dry add more stock and continue to simmer until the rice is almost cooked.
When the rice is almost cooked add the prawns and smoked haddock. Cover again and cook for 8–10 minutes, check that the prawns and haddock are cooked through.
Divide the spinach between the serving bowls and place a portion of paella on top. Sprinkle with a little chopped parsley and serve.
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