Ingredients:
2 sliced onions
200g chopped curly kale
30ml balsamic vinegar
8 beaten large eggs
100g hard goat’s cheese
15ml olive oil
(serves 4)

Method:
1. Preheat the oven to 190°C.
2. Heat the olive oil in an ovenproof frying pan. Add the onions and cook until soft and caramelised.
3. Add the kale with a little water and cook for around 5 mins until the kale has wilted.
4. Add the balsamic vinegar and cook for a further minute.
5. Season the eggs and stir into the pan. Leave to cook for around 5 mins until the egg is nearly set and the frittata is starting to go golden brown on the bottom.
6. Crumble the goat’s cheese over the top of the frittata and put the pan into the oven. Cook for 10 to 15 mins until it is set in the centre and the cheese is bubbling and golden.