Mix the garlic and onion powder with 1/2 cup of hot water to dissolve.
Add the rest of the ingredients, except the seafood and the remaining water. Whisk in the water slowly until the sauce is not so thick.
CHEF'S NOTE: The sauce needs to be a little thin so it will mix well with the seafood.
For each serving, add 2 ounces cooked crab, 3 poached scallops (sliced), and 2 shrimp (16 to 20 per pound) sliced lengthwise to a cup with some sauce.
Servings: