Boil the green beans in a saucepan of water for around two minutes. Drain the hot water and rinse the beans under cold water.
Make a dressing of oil, vinegar, mustard, garlic, salt and freshly ground pepper in a bowl by mixing them together. Peel the oranges and hold them over the bowl (to catch any dripping juice) and using a knife, cut the soft flesh out of the membranes. Squeeze the membranes in the end for any remaining juice.
To the dressing in the bowl add green beans, red kidney beans and onion and toss well together. Add the salami too. Mix lightly.
Arrange a radicchio leaf on each of the four serving platters. Scoop up the bean salad, dividing between the four and serve right away.