Drain the peperoncini. Clean, wash and drain the salad. Peel onions and cut into fine rings. Wash and slice the tomatoes. Wash the basil and pluck the leaves.
Mix everything in a large salad bowl.
Cut the ciabatta into thin slices and possibly halve it. Heat 3-4 tablespoons of oil in portions in a large frying pan. Fry the slices of bread for about 2 minutes on each side until golden brown. Drain on kitchen paper.
Mix vinegar, honey and mustard. Season with salt and pepper. Fold in 3 tablespoons of oil. Mix the marinade and the prepared salad ingredients and carefully fold in the toasted bread. Serve immediately.