To make the sauce, combine the 2/3 cup soy sauce, 1/3 cup sugar, 1 tablespoon apple cider vinegar, 1 teaspoon garlic puree, 1 teaspoon Worcestershire sauce, and 1/2 teaspoon minced ginger. Set aside.
Set your pressure cooker to brown and allow to heat up. Add the 1 tablespoon toasted sesame oil and when it is hot, add the 2 pounds boneless skinless chicken thighs. Allow to brown for about a minute or so on each side just until it starts to turn golden brown.
Add the sauce to the browned chicken and stir to coat. Set the pressure cooker to high pressure and set the time to 8 minutes. It will take about 5 minutes to get to pressure. Once done cooking, so a quick release of the pressure. Remove the chicken, set aside, and tent with foil to keep warm.
In a small dish, combine 1 tablespoon corn starch with 1 tablespoon of water to make a slurry. With the lid off, set the pressure cooker to saute and add the cornstarch slurry. Whisk constantly and cook until it thickens, about 5 minutes.
Serve chicken with additional sauce. It goes great with rice and steamed broccoli.