Boil the spaghetti following pack
instructions. Meanwhile, heat the oil
in a non-stick pan. Add the carrots,
celery and bacon, and stir well. Cover the pan and cook, stirring
occasionally, for 10 mins until the
veg has softened.
Tip in the pesto, warm through,
then stir through the drained
spaghetti with the basil, if using.