Chop the cabbage very finely, add salt and mash it to a soft, elastic state.
Peel the apple and avocado, cut into slices and pour plenty of lemon juice in order not to darken. Combine all the ingredients of the salad with shrimp in a salad bowl, adding finely chopped onions and parsley.
Prepare the dressing dressing by mixing all the ingredients, add salt, pepper to taste and finely grated lemon peel.
Season the salad before serving, just before eating.