Place the olive oil in a pan and heat on medium.
Add in the couscous and toast for around 3-5 minutes.
Add in the water and simmer for around 10-12 minutes – the liquid should have been absorbed by this time.
In the meantime, slice the cucumber and cut each slice into halves, half the tomatoes, dice the red onion and chop the parsley.
Once cooked, tip the couscous into a large bowl, add in the cucumber, tomatoes, onion, feta cheese and parsley.
Whisk together the lemon juice and olive oil and season with salt and pepper.
Drizzle over the couscous, toss and serve.