To make vinaigrette, whisk together maple syrup, mustard, kombucha, vinegar, and salt. (The kombucha will make the mixture bubbly and that is totally fine!) Continue whisking while adding the olive oil. Taste for flavor and adjust as necessary.
To massage the kale, place kale pieces in a large bowl. Generously drizzle vinaigrette all over the kale. Roll up your sleeves and use your hands to massage the kale greens until they start to break down and become tender and a darker green color, almost like sautéed kale greens would look.
Add optional toppings and toss together with greens. Serve with additional vinaigrette, if desired. Enjoy!