In a medium saucepan over med/high heat, pour the water, orange juice, lemon juice, vinegar, soy sauce, orange zest, sugar, ginger, garlic, onion powder, and cayenne pepper - Mix together
Bring to a boil, and reduce heat to simmer, while you stir for about 1 minute
Remove from heat, and allow to cool down
When the marinade has cooled enough, pour 1 cup of the sauce into a large ziplock bag
Add the chicken tenderloins - Set the bag down so all of the chicken is immersed in the juices while you work on the flour mixture
In a large mixing bowl, mix the flour, salt, and pepper
Place the flour mixture into another large ziplock bag
Grease a small oven dish
Place the bag of chicken, a bag of flour, and oven dish in front of you
Using tongs, grab the chicken tenderloins, and place them in the flour bag, seal, and shake
Using tongs, grab the floured chicken, and place the pieces side by side in the baking dish
Divide the butter up and add a dab of butter on each piece of chicken
Bake at 375 for about 15-20 minutes, or until chicken is white in the middle, and juices run clear
When the chicken is almost ready, mix the paste together with four and water
Add the paste to the reserved sauce that is already in the saucepan, and whisk, heat until sauce thickens
Serve chicken over white rice, adding sauce, and fresh chopped green onion