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Heat the oil in a medium pan and fry the onions, garlic, bay leaf and chilli for 3 mins. Add the cumin, paprika and cayenne, season, then cook for a further 3 mins. Add the pepper and cook for 5 mins until it starts to soften.
Add the chopped tomatoes and stock, lower the heat and simmer for 20-25 mins until you have a thick ragu, then stir in the finely chopped coriander.
Heat oven to 180C/160C fan/gas 4. Lay each flatbread on a baking tray. Put half the vegetable mix in the centre of each and spread it out a bit, keeping at least an inch spare all the way around as a border. Make a small well in the centre and crack an egg on top of each flatbread. Crumble over the feta and put in the oven for 12-15 mins until the egg is set and the cheese melted slightly. Scatter over the remaining coriander and serve.