Cook shrimp and scallops in boiling water for about 2 minutes then shock in ice water to stop cooking process.
Peel the shrimp, cut into bite size pieces and quarter the scallops. Pick the crab meat looking for any bits of shell.
In a separate bowl whisk all remaining ingredients to make imperial sauce. Pour half of the sauce into the shrimp, scallops and crab mixture. Gently fold to combine ingredients.
Let mixture set up for 30 minutes in the fridge. Next portion out mixture into oven safe dishes. Bake at 425 for about 10-12 minutes until a light crust begins to form
Then top the seafood with remaining imperial sauce mixture and continue baking for another 5-7 minutes until sauce turns golden brown.