Whisk together the orange juice, soy sauce, honey, cornstarch, sesame oil, ginger, 1 teaspoon salt and several grinds black pepper in a large microwave-safe bowl. Add the broccoli and toss to coat. Cover with plastic wrap and microwave until the broccoli is crisp-tender and still bright green, about 4 minutes. Remove the plastic wrap and let cool completely.
Transfer the broccoli with the marinade to a large resealable plastic bag and add the chicken. Squeeze out most of the air and seal, then toss gently to coat the chicken with the marinade. Freeze until ready to use. Thaw in the refrigerator for at least 24 hours before cooking.
Pour the chicken, broccoli and marinade into a large skillet and heat over high heat. Cook, stirring often, until the chicken is cooked through, about 12 minutes. Season with salt and pepper.
Divide the chicken and broccoli among 4 plates. Serve with rice and garnish with scallions and sesame seeds.
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