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Heat oven to 200C/180C fan/gas 6. Cut the white ends from the spring onions and slice them in half lengthways. Finely chop the green tops. Tip the butter, flour, mustard and milk into a non-stick pan with seasoning, and whisk over the heat until the mixture thickens to make a sauce. Add the whites of the onion and cook for a few mins, stirring until they start to soften. Stir in the sweetcorn and tuna.
Heat the tortillas following pack instructions. Divide the mixture between the tortillas and roll up like pancakes. Arrange the pancakes in a large, buttered ovenproof dish as you roll them. Mix the cheese with the onion tops, sprinkle over the pancakes and bake for 25 mins until bubbling hot.