Preheat your oven to 425°F (220°C). Line an extra-large rimmed commercial baking sheet with parchment paper.

In a medium bowl, whisk together the low-sodium soy sauce, warm water, brown sugar, toasted sesame oil, minced garlic, grated ginger, and cornstarch until the sugar dissolves and the cornstarch is completely blended.

Toss the broccoli florets with 1 tablespoon of oil, salt, and pepper. Spread the broccoli across half of the baking sheet.

Place the sliced beef in the remaining bowl with the sauce, reserving 3 tablespoons of sauce for basting later. Toss the beef strips until evenly coated. Arrange the beef in a single layer on the other half of the baking sheet without overcrowding.

Bake at 425°F (220°C) for 10 to 12 minutes until the broccoli is crisp-tender with charred tips and the beef is caramelized and cooked through.

Switch the oven to HIGH BROIL for 2 minutes to blister the edges and caramelize the sesame glaze.

Remove from oven, drizzle with the reserved sauce, and sprinkle generously with toasted sesame seeds and sliced green onions. Serve hot over steamed jasmine rice.