Step 1:
1)Heat the oil in a frying pan. Add the onions and potatoes. Fry for 8-10 minutes or until tender and golden. Step 2:
2)Add the chorizo and fry for 2 minutes. Shake the pan until the onions, potatoes, and chorizo form an even layer and drain off excess oil. Step 3:
3)Beat the eggs, pour into the pan, and cover. Cook over a medium heat for 5 minutes until the eggs begin to set. Step 4:
4)Cook the omelette under a hot grill for 2 minutes or until all the egg has set and the top is brown. 