Oh Dear, I might suffer for this, but here goes.

Marie Rose Seafood Sauce

Combine 2 tablespoons mayonnaise with 2 tablespoons tomato ketchup and 2 tablespoons double cream.

Add 1 teaspoon Worcestershire sauce, a squeeze of lemon juice, and a dash of Tabasco (optional).

I had a prawn dish at a restaurant called the Chocolate Buddha in Federation Square, Melbourne, and it would have needed double the ingredients specified. Prawns like lobsters they were, yum yum, hope they have them in Sydney too.
Giok