Boil the rigatoni or penne “al dente” by cooking them less than stated on the pack. They should remain a little hard so that then they will continue to cook in the oven.
COOK THE BECHAMEL SAUCE
Melt the butter in a saucepan stirring in the flour.
Gradually stir in the milk to make a thick white sauce.
Remove from the heat and stir in almost all of the grated cheddar except a handful to leave at the end.
PREPARE THE TUNA BAKE
Drain the pasta, mix with the bechamel sauce, drained tuna, drained sweetcorn and a large handful of chopped parsley then season with salt and pepper.
Add the pasta mix to a baking dish and top with the rest of the grated cheddar.
Bake for 15-20 mins until the cheese on top is golden and starting to brown.