In a medium bowl whisk together cornstarch, salt, black pepper, red pepper flakes and water until a batter forms.
Add thin sliced pork to cornstarch mixture and mix, ensuring each piece of pork is evenly coated.
Preheat avocado oil in a pan on medium-high heat. Lay pork in one layer in pan. Cook until golden, about 7 minutes, then flip and cook for another 5 minutes or until cooked through.
Remove pork from pan and set aside. Add jalapeño, onion, garlic and red bell pepper to pan. Sauté for 5 minutes, until onion is translucent and peppers are tender.
Add pork back to pan and cook for an additional 5 minutes. Serve hot.