Beet Poke with Avocado Wasabi Mash

Name: Beet Poke with Avocado-Wasabi Mash
Ingredients: 2 1/2 pounds medium beets, scrubbed; 1 navel orange, halved; One 3-inch piece of fresh ginger, sliced and smashed; 2 tablespoons extra-virgin olive oil; Kosher salt; Pepper; 1/3 cup macadamia nuts; 1/2 cup wakame seaweed; 1/4 cup plus 2 tablespoons unseasoned rice vinegar; 1 tablespoon toasted sesame oil; 1/2 cup very thinly sliced sweet onion; 1/4 cup thinly sliced scallions; 2 Hass avocados—peeled, pitted and cut into large chunks; 2 teaspoons fresh lemon juice; 2 teaspoons wasabi powder; 1 golden beet, peeled and sliced paper-thin, for garnish (optional)