Blend all of the dressing ingredients together until smooth, add water, if needed to thin. Adjust seasonings, adding oil, water, salt and pepper to taste.
Assemble the salad: tear the kale into bite-size pieces, toss until it is coated with dressing and set aside.
Core and slice the apple into thin slices. Add to the bowl of kale along with the sprouts and toss with a little more dressing. Adjust seasonings and serve.