I am not familiar with the PF Chang's sauce, but my homemade go-to stirfry sauce is about 1/2 cup of soy sauce, 1 tbsp of rice wine vinegar, 1 tbsp of brown or white sugar, a bunch of fresh grated ginger, garlic powder, and a teeny bit of sesame oil. You can cook it down to thicken it or whisk in corn starch from the get go. I add it at the end of a stirfry or toss with noodles (great with about 1/4 cup of peanut butter mixed in as well).