Slice the zucchini really thin, about 1/16-inch thick on a mandolin or a food processor. Place them in a bowl, toss with salt and let stand for 30 minutes.
Prepare the marinade by mixing the sunflower oil with the rest of the ingredients.
Drain the zucchini. Handful by handful, gently press with your hands to remove excess liquid. Place in a bowl. Add the marinade and mix well.
Transfer to an air tight container and refrigerate overnight before serving.
Marinated zucchini will keep in an air tight container in a fridge for up to 7 days.