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  • STEP 1

    Heat oven to 180C/fan 160C/gas 4.

  • STEP 2

    Boil 600g rigatoni for 2 mins less time than stated on the pack.

  • STEP 3

    To make the sauce, melt 50g butter in a saucepan and stir in 50g plain flour.

  • STEP 4

    Cook for 1 min, then gradually stir in 600ml milk to make a thick white sauce.

  • STEP 5

    Remove from the heat and stir in all but a handful of the 250g grated cheddar.

  • STEP 6

    Drain the pasta, mix with the white sauce, two 160g drained cans tuna, one 330g drained can sweetcorn and a large handful of chopped parsley, then season.

  • STEP 7

    Transfer to a baking dish and top with the rest of the grated cheddar.

  • STEP 8

    Bake for 15-20 mins until the cheese on top is golden and starting to brown.