M&S Collection 2 Prawn & Salmon Terrines Two slices of prawn, salmon and dill mousse topped with a Honduran king prawn and finished with cream cheese and dill. Gluten free. Two per pack. Ready to eat.  Available for Christmas deliveries from 20th December - 24th December, Use by 26th December  Welcome to Collection from M&S, where exceptional quality and intricate attention to detail makes for something truly special.