This recipe originated as the sauce for Vegetable Kung Pao. In that recipe, we use the parsnip poaching liquid which is ideal for this recipe. However, we modified this recipe since you're not always working with parsnips.
Gently heat the extra virgin olive oil over low heat, and add the kelp granules. Continue to cook for 2 minutes.
Add the water, soy sauce, rice wine vinegar, black vinegar, and poultry seasoning. Bring to a boil, then reduce to a simmer, cooking for another 2 minutes.
Whisk the water and cornstarch together to make the slurry.
Whisk the slurry into the sauce.
Cook over medium heat until thick and the sauce has produced a few bubbles.