1) Heat 1 tbsp of the oil in a large frying pan over a medium heat. Season the prawns with salt, pepper and oregano. Place the prawns in the hot pan (or hob griddle pan) and cook for 2 minutes on each side, until opaque and cooked through.
2) Meanwhile, in a medium bowl, combine the mayonnaise, chives, gherkins and lemon zest. Mix well and season to taste with salt and pepper.
3) In a large bowl, combine the ditalini, remaining olive oil, peppers, parsley and vinegar. Toss to combine and season, to taste, with salt and pepper.
4) Toss the prawns in the sauce, and serve with the ditalini pasta salad.