To make the teriyaki sauce: blend together ⅓ cup soy sauce, ¼ cup neutral cooking oil, the juice of 1 orange, ¼ cup maple syrup, 1 garlic clove, and ½ inch of peeled ginger until smooth.
No blender? Mince or grate the garlic and ginger, then whisk everything together.
Pour the mixture into a saucepan or skillet. Add the salmon, skin-side-up, to the marinade. Do not put the skillet over heat, we’re just marinating the salmon in there!
Preheat oven to 450°F
Add the cauliflower rice to a rimmed half baking sheet and stir in 1 tablespoons neutral cooking oil, 2 tablespoons of the marinade, and a big pinch of salt. Toss to coat, then spread into an even layer over half of the baking sheet. Toss 16 ounces green beans, 2 tablespoons sesame oil, 1 teaspoon sesame seeds and ½ teaspoon kosher salt. Spread into as an even a layer as possible over the second half of the baking sheet.
Bake for 10 minutes.
Remove sheet-pan from the oven. Raise the heat to broil. Stir the vegetables, keeping them separate, then lay evenly again. Create two spaces where the salmon can fit and place it on the sheet-pan skin-side up, not touching the other filets.
Return sheet-pan to the top rung of the oven and broil for 5 to 8 more minutes, depending on doneness preference. I like my salmon medium-rare (125°F), so I roast it for 8 minutes. Medium: 135°F, well-done: 145°F.
While the salmon is roasting, bring the marinade to a boil over medium-high heat.
In a small bowl, stir together 3 tablespoons of water and 2 tablespoons of cornstarch. Stir HALF of the cornstarch slurry into the boiling sauce and cook until thickened to your liking - this happens very quickly, just 30 seconds or so! Add more of the cornstarch slurry if you need it. Stir in 1 teaspoon sesame seeds.
Serve the salmon and green beans atop the cauliflower rice, drizzled with lots of teriyaki sauce. Garnish with sesame seeds and cilantro.