Steps
1. Peel and thinly slice the potato and onion.
2. Heat olive oil in a non-stick pan over medium heat.
3. Add the potato and onion slices to the pan and cook until the potato is tender, about 10 minutes.
4. Meanwhile, beat the eggs in a bowl and season with salt and pepper.
5. Slice the tomato and set aside.
6. Once the potato and onion are cooked, remove them from the pan and drain any excess oil.
7. Add the potato and onion mixture to the beaten eggs and stir to combine.
8. Return the mixture to the pan and cook over low heat for 5 minutes, or until the eggs are set.
9. Toast the bread slices.
10. Serve the Spanish tortilla with the tomato slices and toasted bread.