Start by dicing the onion and bell pepper.
In a large bowl mix together the salmon, diced onion and bell pepper, egg, Worcestershire sauce and self-raising flour. Mix everything together well.
In a separate bowl mix together the cornmeal, salt and pepper.
Heat the oil in a large pan over medium heat.
Take 2 tablespoons of the mixture and roll it into small balls and coat them with the cornmeal mix.
Place the salmon croquettes in the hot oil and fry until golden brown, about 3 minutes per side.
Remove from oil and drain on a kitchen towel or paper towels.
Place them on a plate and serve hot.