Place the soy drink, mustard, vinegar, oil, a little salt and pepper in a tall mixing bowl. Mix with a hand blender for 1-2 minutes to a thick creamy sauce.
Clean and wash the spring onion and cut into fine rings. Drain the cucumbers. Wash, halve and core the apple. Cut cucumber and apple into fine cubes. Add the spring onion to the sauce.
Season remoulade with salt, pepper, sugar and gherkin water.