Cook the couscous according to package directions. I pour 1 cup of boiling water over, stir it and leave it to sit for 5 minutes before fluffing up with a fork.
Finely chop the parsley and add to the couscous along with the lemon juice and olive oil and stir to combine.
Season with salt & pepper and serve immediately or store in the fridge in an airtight container for a few days.