Rinse the kale and remove tough stems. Chop into bite-size pieces.
Shred the cabbage thinly and combine with the kale in a large bowl.
In a small bowl or jar, whisk together apple cider vinegar, olive oil, Dijon mustard, maple syrup (or honey), salt, and pepper until smooth.
Pour half of the dressing over the kale and cabbage. Using your hands, gently massage the dressing into the kale for about 1–2 minutes. This softens the leaves and makes them less bitter.
Toss in the roasted almonds for crunch.
Drizzle the remaining dressing over the salad just before serving.
Toss well and enjoy as a side dish or pair with grilled chicken, salmon, or tofu for a full meal.