1. Halve the unpeeled cucumber, remove part of the seeds and then slice.
2. Take onion and cucumber in a large bowl. Add mushrooms, cherry tomatoes, green olives and black olives and mix.
3. For dressing take olive oil in a bowl. Add balsamic vinegar, salt, crushed black peppercorns and garlic and mix. Tear lettuce leaves and add to the bowl of vegetables. Add hand torn fresh basil leaves and mix.
4. Slice French bread and further break into smaller pieces and add to the vegetables in the bowl.
5. Add the dressing, toss well and serve immediately.