Whisk sauce ingredients together in a measuring cup and set aside.
Place noodles into your Pressure Cooker cooking pot and add 3.5 cups of fresh water Dump in sauce.
Lock on Lid and close Pressure Valve. Cook at High Pressure for 0 minutes. When Beep sounds, allow a 2 minute Natural Pressure Release and then carefully and slowly release the rest of the pressure.
Remove cooking pot from Pressure Cooker and dump into a big serving bowl. Toss with scallions and drizzle with Toasted Sesame Oil. Serve.
If using Rose Brand Gourmet Chinese Egg Noodles, set your Pressure Cooker to "0" minutes. If using another type of thin noodle, set Pressure Cooker to 2 minutes less than half the time of the lower number on the package directions.