The Queen was famed for her love of cucumber sandwiches, but you might not have known that the late monarch's favorite snack contained a secret ingredient.
- The late Queen Elizabeth's favorite cucumber sandwiches contained a secret ingredient that you can easily pick up at your local store.
- A TV presenter revealed the added ingredient while discussing having afternoon tea at Buckingham Palace.
- In other royal news, this is the color that Kate and William prefer to match in.
