Preheat oven to 400°F.
Meanwhile combine sweet potatoes, avocado oil, ground ginger, and salt and pepper in a large mixing bowl and toss thoroughly to combine. Spread in even layer on non-stick or foil lined baking sheet and roast for 20 to 25 minutes, stirring halfway through, until slightly caramelized and fork tender. Remove from oven and let cool completely.
Add sweet potatoes, mizuna lettuces, daikon radish, red onion, toasted sesame seeds, and a 1/4 cup of Miso-Ginger Dressing (or more as desired) to large mixing bowl and toss thoroughly to combine. Serve immediately.