Ingredients

Steps

• Heat the butter and oil in a large heavy-based frying pan.
• Cook the onions slowly until they are soft and transparent.
• Add the potato slices and fry them gently for two minutes.
• Stir the chopped spinach into the potato and onion mixture.
• Season the beaten eggs and pour them into the frying pan.
• Cook over low to medium heat for ten minutes until the egg is mostly set.
• Invert the tortilla onto a plate and return it to the pan to cook the other side.
• Cook over low heat until the tortilla is fully set through.
• Slice into cubes or wedges and serve at your preferred temperature.