Gather all your ingredients and ensure they are measured and ready to go.
In a mixing bowl, combine the soy sauce and molasses. Whisk until smooth and fully integrated.
Add sesame oil, rice vinegar, peanut butter, minced garlic, and sriracha sauce to the mixture. Stir well to combine.
Add ground pepper to the mixture and mix until evenly distributed.
If a thinner sauce is desired, add water and mix. For a thicker sauce, prepare a cornstarch slurry and add it while stirring until desired thickness is achieved.
Taste your sauce and adjust flavors if necessary.
Transfer the sauce to a storage container, seal tightly, and refrigerate. Best used within a week.
