Possible Clues:

• Cinque Port snack maybe
• Snack for heartless sorcerer on the other side of beach blanket
• Jam - might that be in one?
• Deli purchase
• Eat this in Kentish Town?
• It could be full of baloney
• Jam in snack
• Ocean liner which lacks height? The one that's toasted and named after The Lord!
• Snack using sliced bread
• Not having this food in a picnic is crazy