Combine pork slices with soy sauce, rice wine, and cornstarch in a bowl. Marinate for 15 minutes.
Mix all Szechuan sauce ingredients in a small bowl and set aside.
Heat oil in a wok or large skillet over high heat. Add marinated pork and stir-fry for 3-4 minutes until browned and cooked through.
Add bell pepper and onion to the wok and stir-fry for 2-3 minutes until vegetables are crisp-tender.
Add garlic and ginger, stir-fry for 30 seconds until fragrant.
Pour in the Szechuan sauce mixture and stir continuously for 1-2 minutes until sauce thickens and coats the pork well.
Remove from heat and serve immediately with steamed rice or noodles.