Save time by buying ready-trimmed and sliced runner beans.
Cook the pasta according to pack instructions. Tip in the runner beans and sweetcorn (if using fresh or frozen) for the final 4 mins of the pasta cooking time. Drain and set aside.
Mix the fromage frais and pesto together, then pour into the same saucepan, along with the prawns. (If you’re using canned sweetcorn, add it now.) Warm through briefly over a low heat, then tip in the pasta and veg. Take off the heat, toss together and sprinkle with coriander, if using.