In a small bowl, whisk together the soy sauce, sesame oil, rice vinegar, and honey (or brown sugar) until well combined.
Add the minced garlic, grated ginger, chili flakes, and black pepper to the bowl. Stir well to incorporate all the flavors.
Taste the seasoning and adjust the ingredients according to your preference. If you want it saltier, add a bit more soy sauce.
If you like it sweeter, add a touch more honey or brown sugar. If you prefer it spicier, increase the amount of chili flakes.
Once you're satisfied with the flavor, your stir-fry seasoning is ready to use!