Wash the cucumbers thoroughly and trim both ends. Peel the carrots and remove their ends as well. Using a julienne peeler, create long, thin ribbons from both vegetables and place them into a large mixing bowl.
In a small bowl or measuring cup, combine the grapeseed oil, rice vinegar, sesame oil, maple syrup, soy sauce, salt, ginger powder, and white pepper. Whisk everything together until the ingredients are fully blended and smooth.
Pour the prepared dressing over the cucumber and carrot ribbons. Gently toss the vegetables until every ribbon is evenly coated with the dressing. This ensures the flavor reaches every bite.
Sprinkle the white and black sesame seeds over the salad. Toss lightly once more to distribute the seeds throughout the vegetables. The sesame seeds add a pleasant crunch and nutty finish.
Place the salad in the refrigerator for at least 10 minutes before serving. This resting time allows the vegetables to absorb the dressing and develop a deeper flavor.
Remove the salad from the refrigerator and give it one final toss. Transfer it to a serving bowl or platter and enjoy it as a refreshing side dish or light meal.