Marinate the Salmon: Whisk together the miso, soy sauce, honey, rice vinegar, vegetable oil, sesame oil, ginger, and garlic. Place the salmon in a baking dish, coat thoroughly with the marinade, and refrigerate for 2 hours.
Soak the Plank: Soak the cedar planks in water for at least 1 hour to prevent them from burning quickly.
Preheat the Egg: Prepare the Big Green Egg for direct cooking at 400°F.
Toast the Plank: Place the soaked planks on the raised grid for 3 minutes, then flip them over.
Cook the Salmon: Place the marinated salmon on the hot planks and cook for approximately 20 minutes, or until the internal temperature reaches 130°F.
Prep and Cook the Veggies: Meanwhile, spiralize the zucchini and squash. Toss the spirals with olive oil, garlic, salt, and pepper. Place them in a perforated veggie basket and cook over direct heat on a MiniMax (or on a separate grate) for 10 minutes, or until tender-crisp.
Rest & Serve: Pull the salmon from the grill and let it rest for 10 minutes. Garnish with white sesame seeds, then serve alongside the grilled veggies and jasmine rice.