Cook the tagliatelle according to the packet instructions and drain, reserving a cup of the cooking water.
Chop the onion and tip into a deep frying pan with the olive oil. Cook over a medium heat for 2 mins until the onion has begun to soften.
Pour in the reserved pasta cooking water, then add the frozen peas and creme fraiche. Stir. Turn the heat down a little, and allow to simmer.
Chop the feta into small chunks and add to the sauce. Season with black pepper (the feta is salty so there's no need to add any more) and the lemon juice, then sprinkle in the chopped parsley.
Combine well with the tagliatelle and serve - enjoy!
Video
Notes
Variations
Add greens: Swap the peas for spinach, kale or courgette ribbons.
Go spicy: Stir through chilli flakes or drizzle with chilli oil before serving.
Make it extra creamy: Add a spoonful of mascarpone or a touch of butter.
Add protein: Toss in leftover chicken, prawns or crispy pancetta.