Quarter the cucumber lengthways.
Cut each quarter into roughly 1cm
chunks, cutting on the angle to give a
more interesting shape. Scatter into
a serving bowl or onto a platter. Add
the radishes, celery, onion and parsley.
Put the lemon juice and oil in a glass
jar with a lid, season and shake well.
When ready to serve, pour the dressing
over the salad and toss to combine.