2) Whisk together the lemon juice, 8 tbsp of olive oil, 2 tsp of salt and 1 tsp of pepper. Pour over the hot pasta and stir well.
3) Meanwhile, place the prawns on a baking sheet, drizzle with olive oil and sprinkle with salt and pepper. Toss to combine and spread out in a single layer. Roast for 5 to 6 minutes, until the prawns are cooked through. Don't overcook!
4) Add the prawns to the orzo and then add the spring onions, dill, parsley, cucumber, onion, 2 tsp of salt and 1 tsp of pepper. Toss well. Add the feta and stir carefully. Set aside at room temperature for 1 hour to allow the flavours to blend, or refrigerate overnight.
5) If refrigerated, taste again for seasoning and bring back to room temperature before serving.