Combine pork strips with soy sauce, rice wine, and cornstarch in a bowl. Marinate for 20 minutes at room temperature.
Whisk together rice vinegar, sugar, water, soy sauce, and cornstarch in a small bowl to create the sauce. Set aside.
Heat wok or large skillet over high heat until smoking. Add oil and swirl to coat.
Add minced garlic, ginger, and doubanjiang to the hot oil. Stir-fry for 15-20 seconds until fragrant.
Add marinated pork to the wok and stir-fry for 2-3 minutes until pork is opaque and nearly cooked through.
If using vegetables, add them now and stir-fry for 1-2 minutes until crisp-tender.
Give the sauce mixture a quick stir and pour into the wok. Cook for 1-2 minutes, stirring constantly, until sauce thickens and coats the pork.
Remove from heat and serve immediately over steamed rice.