Heat a large pan on a medium setting. Add the chorizo and fry until it starts to sizzle and release its fat.
Add the onion, peppers and garlic and fry for a further 5 mins until soft.
Add the thawed seafood cocktail and Cajun seasoning. Fry for 3 mins.
Add the rice, tomatoes, stock cube and 350ml boiling water to the pan. Stir to combine. Cover with a lid and simmer for 20-25 mins, stirring occasionally, until all the water is absorbed and the rice is tender.
To Serve:
Sprinkle with the chopped parsley and serve with the lemon slices, to squeeze over.