In a bowl, combine all sauce ingredients; set aside.
Place a skillet or wok over high heat. Add oil, swirling to coat sides. Add ginger; stir-fry for a few seconds. Add onion, green pepper, and dried red chilies. Stir-fry for 2 minutes or until vegetables are soft and chilies are fragrant.
Add shrimps and roasted peanuts; keep stirring until shrimps are almost cooked.
Give the sauce a quick stir and then add into the wok, stirring until sauce boils and thickens. Add green onions and stir to coat.