Preheat your oven to 180C/Gas 4.
Cook and drain pasta.
Heat the butter in a pan until melted and add the flour to thicken it. When mixed in well with a wooden spoon, gradually add the milk in parts to form a ‘béchamel’ type of sauce.
Remove from heat and add most of the cheese (save enough to sprinkle on the top at the end).
Add the diced vegetables and season with salt and pepper.
Add the pasta to the mixture and also the contents of 1 can of Tuna.
Get the dish you will be making the bake in and create a layer of Tuna at the bottom with the remaining can
Spoon the mixture evenly on top of the Tuna layer and cover with the cheese you set aside before.
Cook for approximately for 15 – 20 until the cheese is golden-brown.
Enjoy!