Simply follow our simply laid out recipe:
1) Preheat the oven to 150°C, Gas 2.
2) Heat the oil in a frying pan. Fry the vegetables in batches, starting with the onions and chilli; transfer to a casserole.
3) Season and pour in enough vegetable stock to cover and lay the sliced tomatoes on top.
4) Cover and cook in the oven for 45 minutes.
5) Mix together the egg, yoghurt and parsley and pour on top of the casserole.
6) Return, uncovered, to the oven for another 10 minutes.
7) Serve with crusty bread.