Peel and chop the onion, remove the core of the apple and cut it into small pieces too. Mix the shrimp, onion and apple cubes well with the remaining ingredients and then season the shrimp cocktail to taste and let it steep in the refrigerator.
Variant:
Peel and core a ripe avocado, cut into small cubes and fold in.
Toasted sandwich bread or ciabatta goes well with this. Depending on the portion size, the shrimp cocktail is suitable as an appetizer or starter, but it also looks great at a cold buffet.