Cook the pasta following the directions on the packet.

Tip the contents of the sachet into a saucepan, add a splash of milk.

Mix well, then stir in remaining milk.

Bring to the boil, stirring continuously.

Add the tuna, sweetcorn and cooked pasta, simmer for 1 minute stirring continuously.

Pour into an ovenproof dish. Top with cheese and place under a hot grill until golden.