Combine shrimp pieces (make sure they are blotted dry), celery and scallions in a medium bowl. Set aside.
In a small bowl combine all sauce ingredients and whisk until well incorporated.
Pour over shrimp mixture. Mix well.
Let it sit for at least an hour and up to overnight.
Serve in small shooter cups with small spoons, on Chinese style spoons or on endive spears. (Did you know...Endive is a great source of Folate, fiber and vitamins A and K...eat up!)
Tip for endives: Slowly separate endives, slice a bit off of the core as you break each stalk off. The endive spears will get smaller and smaller. Place them on a serving platter. When ready to serve fill each with a bit of the mixture.
