Wash the kale leaves and pat them dry. Remove the leaves from the stems and finely chop the leaves (you can save the stems for smoothies or feed them to your dog!). Place the kale leaves in a large serving bowl and add half the lemon juice. Massage the kale leaves (taking large amounts in your palms as though you're ringing out a dish towel) until they begin to wilt and soften, about 2 to 3 minutes. Allow the leaves to sit 10 minutes to soften further.

In a small bowl, whisk together the remaining lemon juice, olive oil, and sea salt. Pour dressing over the salad. Add the diced avocado, pickled red onions, and sunflower seeds, and toss everything together until well combined. Serve alongside your favorite entree, and enjoy!