Peel the pre-cooked beetroot and cut it into very fine cubes (brunoise).
Peel the red onion and also cut it into fine cubes (brunoise). Divide the diced onion into two halves.
Peel the garlic clove and ginger. Chop both very finely. Divide the chopped garlic into two halves.
Halve the lemon. Squeeze the juice from one half and grate the zest of the entire lemon (lemon zest). Finely chop the parsley.