Preheat the oven and sheet tray to 450°F (232°C).
In a bowl, combine soy sauce, sesame oil, rice vinegar, honey, and white miso. Blend until smooth.
Brush salmon with miso glaze. Reserve half of the glaze for later or another use.
In a large mixing bowl, combine corn, asparagus, scallions, broccolini, olive oil, salt, and black pepper. Toss to combine.
Spread the veggie mix on preheated sheet tray and roast 15-20 minutes.
Halfway through, add the salmon to the top rack and continue roasting until salmon reaches an internal temp of 135°F (57°C).
Plate the succotash, top with salmon, and drizzle with the reserved miso glaze.