How to Make It
In a large bowl, whisk together the mayonnaise, sour cream, sugar, rice vinegar, lemon zest and juice, and 2 teaspoons salt until smooth.
Add the cabbage, carrots, apples, and onion, and toss to coat. Immediately before serving, julienne perilla leaves. Toss slaw with perilla, and season with remaining 1/2 teaspoon salt.