Add cabbage to an extra-large mixing bowl. Use paper towels to squeeze out any excess moisture form shredded carrot, then add to the bowl along with green onion and toss to combine.
Dressing: whisk ingredients together in a medium bowl. Taste and adjust seasonings as needed. Pour dressing over veggies and toss well to coat evenly.
Refrigerate for several hours or overnight before serving, for best results.
