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Heat the oil in a deep frying pan and cook the onion for about 5 mins until soft. Add the chipotle paste, beans, tomatoes and sugar, and simmer for about 15-20 mins until thickened. Season to taste.
Make 4 holes and crack an egg into each one. Cover and simmer over a low heat for 8-10 mins until the eggs are cooked to your liking. Sprinkle with coriander leaves and serve with a bowl of soured cream and some warm flour tortillas.