In a medium bowl, combine soy sauce, lemon juice, rice vinegar, and cornstarch. Whisk well. Add the sliced pork and toss well. Set aside to marinate for at least 10 minutes.
The rest
Bring a large pot of water to a boil. Add the spinach. Blanch the spinach for about 1 minute, or until the spinach is bright green. Don't overcook it. Drain the spinach and set aside.
Heat avocado oil in a large skillet over medium-high heat. Add the garlic, the ginger, and red pepper flakes. Sauté for about 30 seconds.
Add the pork and marinade. Stir-fry until the pork is just barely pink inside, 3-4 minutes. Add the spinach, tossing it with the pork, and cook for 1 minute.
Transfer the pork mixture to a serving bowl or platter and sprinkle with sesame oil. Garnish with chopped green onions and a good shake of toasted sesame seeds. Serve.
Notes
Recipe credit to Ying Chang Compestine, author of Secrets of Fat-Free Chinese Cooking.Please note that I am not a medical or nutritional professional. I provide nutritional information for my recipes as a courtesy to my readers. It is calculated using the built-in recipe card calculator. While I attempt to provide information that is as accurate as possible, you should calculate the nutritional information independently before relying on it.