Place a wok over high heat until hot. Add oil, swirling to coat sides. Add garlic and chile pepper, and cook, stirring, until fragrant, about 10 seconds. Add pork and stir-fry for 2 minutes. Add tofu and sauce. Cook, stirring gently, until tofu is heated through and sauce boils and thickens. Place in a serving bowl and garnish with green onions.