Mix all ingredients together in a bowl and whisk, or add them to a jar and shake well.
Salad
Ribbon the carrot and cucumber using a vegetable peeler. Arrange the ribbons on a plate. Sprinkle with green onions.
Drizzle the dressing on top and sprinkle with black sesame seeds. Serve.
Notes
Keep leftover carrot and cucumber salad in an airtight container in the fridge. It’s best eaten within a day so the veggies stay crisp and the dressing doesn’t water down. If making extra, store the dressing and veggies separately and mix right before eating.