
Heat the oven to 450°F and start the rice according to the package. Cut the cauliflower into bite-size florets.
Toss the florets with 2 tbsp oil, then with 1/3 cup cornstarch and a pinch of salt until coated. Spread on a parchment-lined sheet pan.
Roast 22-25 minutes, flipping halfway, until browned and crisp at the edges.
Meanwhile, whisk soy sauce, hoisin, vinegar, brown sugar, the remaining cornstarch and 1/3 cup water. Heat 1 tbsp oil in a skillet, cook minced garlic and ginger 30 seconds, then add the sauce and simmer 1-2 minutes until glossy.
Toss the roasted cauliflower in the sauce right before serving so it stays crisp. Add red pepper flakes for heat.
Serve over rice topped with sliced green onions.
Photo: DinnerDrop