In a food processor, combine powdered peanut butter, water, sesame oil and rice wine vinegar. Blend for 10 to 15 seconds until combined.
Add scallions, ginger, sriracha and fish sauce. Blend for an addition 20 to 30 seconds until scallions and ginger are finely minced and incorporated.
Add peanuts and pulse 4 to 5 times so the pieces are broken but not blended. It should resemble the same size as 'chunky peanut butter' pieces or larger.
I really like the PB2 or Just Great Stuff brands for Powdered Peanut Butter options.
Ginger paste is a huge time saver and delivers the same great taste without peeling and grinding. You can find it in the produce section where the herbs will be.
Sriracha is totally optional. If you are sensitive to spicy foods, try adding just a little at a time and adding more depending on what you like. The spicy kick will hit your palate at the end of the taste.
Fish sauce adds really great salty flavor. The fish taste isn't noticeable, but if it freaks you out just substitute a pinch of salt.