Mix the tomato sauce, mayonnaise, lemon juice and a very small pinch of salt and pepper in a bowl to create a Marie Rose Sauce.
Wash the King Prawns, dry them (I used kitchen roll) and add them to the mix. Ensure are fully covered with the Marie Rose Sauce you made.
With your serving dishes, decide whether to shred your lettuce, or layer it in your dish. I layered this version.
Serve on top of the lettuce, add tomberries and a little seasoning if desired.