In a large skillet over medium heat, cook the ground pork or chicken until browned. Drain excess fat if necessary.
Add the diced onion and garlic to the skillet. Sauté for 2 minutes until fragrant.
Stir in the shredded cabbage, carrots, and grated ginger. Cook for 5-7 minutes until the vegetables are tender but still crisp.
Drizzle in the soy sauce and sesame oil. Stir well to coat all ingredients evenly.
Season with red pepper flakes (if using), salt, and pepper to taste. Cook for another 2 minutes.
Remove from heat and garnish with chopped green onions and sesame seeds.
Serve immediately and enjoy your Egg Roll Stir-Fry!