Cut the zucchini lengthwise into 4 parts, then cut crosswise into very thin slices.
Chop the cabbage thinly, place in a salad bowl, add the zucchini and the rest of the ingredients: onion cut into feathers, pickled cucumbers cut into cubes, peeled and diced tomato or diced bell pepper.
Season with salt and pepper, add herbs, oil, mustard and mayonnaise, mix everything thoroughly (if needed you can add more mayonnaise if you prefer).