Position oven racks to the top third and lower third slots. Preheat oven to 400ºF (205ºC). Line a baking sheet with parchment paper or a silicone mat and set aside.
Toss potatoes with a tablespoon of olive oil, salt, and pepper. Spread potatoes on baking sheet and place potatoes on the upper third rack. Bake for 20-25 minutes. Season with potatoes with more salt and pepper, if desired.
If you are making the teriyaki sauce, combine tamari, 1/4 cup water, mirin (if using), honey, garlic, and ginger in a saucepan. Heat over medium heat. In a small bowl, mix cornstarch with a tablespoon of water and set aside. Once the tamari mixture reaches a boil, reduce heat to medium-low and add cornstarch mixture. Let sauce simmer for an additional minute and turn off heat.
Sprinkle a pinch of kosher salt on top of salmon pieces.
Line a baking sheet with parchment paper or foil, and place salmon pieces on top. Brush half of the teriyaki sauce on top of salmon. Place baking sheet on lower third rack. Bake for 12 to 15 minutes, depending on the thickness of the fish. Once the fish is done, pull it out of the oven and brush more teriyaki sauce on top. Once salmon is cool enough to handle, use a fork to break it up into flakes.
Heat 1 1/2 tablespoons of olive oil in a sauté pan. Add onions and cook for about 2 minutes, until the onions start to turn translucent. Add zucchini and a pinch of salt, and cook for 2 minutes. Add corn and peas and cook for another 2 minutes. Add more salt, if desired. Turn off heat.
To prepare the salad, toss salad greens with potatoes, salmon, and sautéed vegetables with dressing. Serve immediately. If you want to make this salad ahead, don't toss it with dressing.
NUTRITION INFORMATION: Makes 4 Servings. Amount Per Serving: Calories: 394, Total Fat 16.5g, Saturated Fat: 2.4g, Sodium: 1500mg, Cholesterol: 50mg, Total Carbohydrate: 37g, Dietary Fiber: 6.5g, Sugar: 9g, Protein 29g