To make the vinaigrette, whisk together the olive oil, apple cider vinegar, Meyer lemon juice (or mix of juices), and sugar in a small bowl. Alternatively, you may add the ingredients to a jar with a tight-fitting lid and shake well. Set aside. (The dressing can be made in advance and refrigerated for at least one week.)
Strip the kale leaves from the stems and chop the leaves into small pieces. Discard the stems. If the leaves are wet from washing, pat them dry, and place in a large bowl. (Wet leaves can make the vinaigrette watery, thereby diluting the flavor.) Sprinkle with the salt, and massage the leaves with your fingers for about 2 minutes. The leaves will soften and become a darker green.
Add the remaining ingredients, and then drizzle with enough dressing to coat the kale leaves when tossed. Season the salad with freshly ground pepper and a sprinkle of salt. The salad will keep for several days in the refrigerator.