Peel the turnips and slice finely.
Finely slice the onion
Heat the olive oil in an 8 inch frying pan.
Add the turnip and onion slices, and on a low heat, cook the slice, occasionally turning them until they are golden.
In a bowl, beat the eggs and season with the pepper and salt.
Pour the eggs into the frying pan and on a low heat, cook until the mixture is almost set.
Use a spatula to slightly loosen the edges and carefully flip the pan over a dinner plate and tip out the tortilla. Slide the tortilla back into the frying pan and cook for a further 5 minutes.
Turn out the tortilla onto a plate and enjoy hot or cold.