Top and tail the beans, pull away the strings from the sides and cut at an angle into thin strips. Plunge the beans into a pan of boiling salted water and cook for a few minutes until tender. Drain well.

Melt the butter in a saucepan with the green peppercorns and, once sizzling, add the beans. Stir over a medium heat for 1-2 minutes, season with a sprinkl