1 medium onion, finely chopped
500g/1lb 2oz frozen mixed vegetables or peas
2 tbsp tomato ketchup
300g/10½oz long grain rice
2 tbsp dark soy sauce, plus extra to serve
3 tbsp vegetable oil
6 medium eggs, beaten
125-250g/4½– 9oz skinless leftover roast pork, cut into small chunks