Remove the skin of the chorizo and roughly chop the sausage meat.
Slice the grilled pepper and onion.
In a bowl, lightly whisk two eggs.
Heat a frying pan and add the chorizo then gently cook until the chorizo releases its fat. Transfer them to a plate.
Pour in the egg mixture, letting it spread out evenly.
After a minute or so, when the egg is jelly-like, scatter half the chorizo, red pepper and onion on top. Add some grated cheese if you like.
Turn down the heat and cook for about 5 minutes until the egg has just set and the cheese has melted.
Scatter some parsley on top and fold the omelette in half. Cook for another minute then slide it onto a plate and keep warm.
Make another omelette with the remaining eggs, red pepper and onion pieces.
Cut the omelette in half and serve.