Peel and chop the onion very small. Peel and grate the ginger. Mix together with the lime juice and rice vinegar in a deep bowl. Add the sugar, a pinch of salt and the ginger syrup.
Add the sunflower oil and sesame oil. Mix well and taste. It must taste nice sweet and sour.
Cucumber
Peel the cucumber, cut in half lengthways and remove the seeds. Then cut the cucumber into thin julienne. Mix 2 tsp salt and leave to withdraw. After half an hour, rinse the strings of cucumber under the tap and drain in a sieve.
Put the cucumber in a deep bowl and pour the dressing over it. Stir briefly and let cool in the refrigerator.
Serving
Cut the spring onion into thin, oval slices just before serving. Chop the mint and the parsley.
Sprinkle the cucumber with the herbs, spring onions and lime zest and serve immediately.