Cook the rice according to the package directions. Meanwhile, in a small bowl, combine the hoisin sauce, ½ cup water, soy sauce, and sugar.
In a small saucepan, heat 1½ tablespoons oil over medium-high heat for 30 seconds. Add the scallions, garlic, and red pepper (if using) and cook until fragrant, about 15 seconds. Add the hoisin mixture and bring to a boil. Cook, stirring occasionally, until sauce thickens slightly, about 1½ minutes. Pour into a bowl. Set aside.
Heat a wok or large skillet over high heat. Add 2 tablespoons oil and heat for 30 seconds. Add the steak and stir-fry until cooked through, 3 to 4 minutes. Transfer to a plate.
Wipe out pan. Reduce heat to medium-high. Add the remaining ½ tablespoon oil and heat for 30 seconds. Add the bell pepper and cook, stirring con-stantly, for 10 seconds. Add the sweet potato and ⅓ cup water. Cover partially and cook, stirring occasionally, for 7 minutes. Add the peas and scallions; cook for 1 minute.
Increase heat to high. Add the sauce. When it starts to bubble, add the steak. Stir-fry until warmed through, about 1 minute. Serve immediately over rice.
Very good, but could use some hot peppers. It needs a kick.
Soooo delicious and garlicky! This recipe is always a big hit. Makes great leftovers for lunch or dinner the next day.