For kids - Spinach and Onion Tortilla

5 medium eggs, beaten
2 tb olive oil
1 large spanish onion, halved and thinly sliced
250g fresh spinach leaves
40g cheddar, grated

Preheat the grill to high. Crack the eggs into a large bowl, season and beat briefly with a fork.

Heat the oil in a large frying pan with an ovenproof handle and fry the onion until soft and pale golden. Add the spinach and saute for a couple of mins to wilt the leaves.

Pour the egg mixture into the pan, turn the heat down to its lowest setting and cook the tortilla, uncovered, for about 8mins, until there is only a little runny egg left on top.

Sprinkle the grated cheese over the top and melt under the preheated grill for 1-2 mins, until the top is golden and bubbling. Use a palette knife to slide the tortilla out onto a plate. cut into wedges. leave to cool and store in the fridge, ready to box up for lunch.