Separate kale leaves from the stalk and tear them into bite-sized pieces (about 2x2 inches). Discard or compost kale stalks.
Grate the carrots. Dice the apples and celery and set aside.
Place kale leaves in a large bowl. Cut the lemon in half and set one half aside. In the bowl with the kale leaves, squeeze all the juice out of the remaining lemon half.
Drizzle 1 Tablespoon of olive oil and salt into the bowl with kale and lemon juice. Massage kale until it starts to soften (2 to 3 minutes).
In a small bowl, squeeze the juice from the remaining half of the lemon. Whisk together with honey and black pepper. Gradually whisk in ¼ cup olive oil to make the dressing.
Add apples, celery, carrots, sunflower seeds, and dressing to the kale and toss together.
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Notes
Apples can be replaced with pears, mandarin oranges, strawberries, or craisins.