Prepare the kale: Wash and thoroughly dry the kale leaves. Remove the tough central stems, then finely chop the kale into small bite-sized pieces and place them into a large bowl.
Slice the apple and radish: Cut the apple into thin matchsticks by slicing around the core and cutting each section into thin strips. Slice the radish into similar-sized matchsticks so the fruits and vegetables have a consistent texture and balanced bite throughout the salad.
Grate the carrots: Peel the carrots and grate them using a box grater or food processor. Add them to the bowl with the kale, apples, and radishes.
Make the vinaigrette: In a small bowl or jar, combine all the dressing ingredients except the salt. Whisk until smooth and creamy, then taste and adjust the salt as desired. For an even creamier vinaigrette that stays well combined in the fridge, use an immersion blender to blend the dressing thoroughly.
Chill the dressing: Transfer the vinaigrette to the refrigerator until ready to use. The dressing can be stored in the fridge for up to one week.
Assemble the kale apple salad: Pour about two-thirds of the vinaigrette over the chopped kale mixture. Toss everything together until evenly coated, adding more dressing as needed to suit your preference.
Add the finishing touches: Add the pepitas and raisins, then gently toss again to combine all the ingredients evenly throughout the salad.
Serve and enjoy: This salad is best enjoyed within four hours of preparation for the freshest texture and flavor. If preparing ahead, keep the salad undressed for up to two days and toss with the vinaigrette just before serving, as the apples may brown over time.