Heat large skillet over medium heat. When pan is warm, add 2 tablespoons sesame oil and swirl pan to distribute oil across surface. Continue heating pan until oil is hot and shimmery.
When oil is hot, add white parts of 6 green onions, ½ cup diced red onion, and 5 cloves garlic to skillet and stir to incorporate. Sauté, stirring frequently, until red onions begin to soften, approximately 5 minutes.
When onions have softened, add 1 pound ground pork, 1 teaspoon grated fresh ginger, 1 8-ounce can water chestnuts (if using), and 1 tablespoon sriracha to skillet. Cook, stirring frequently, until pork is browned and crumbled, approximately 7 to 10 minutes.
When pork is cooked through, add 1 14-ounce bag coleslaw mix, 3 tablespoons coconut aminos, 1 tablespoon rice wine vinegar, ⅛-¼ teaspoon freshly cracked white pepper (to taste), and salt to skillet. Stir until ingredients are well incorporated.
Continue cooking egg roll mixture, stirring regularly, until cabbage is tender, approximately 5 minutes.