A tongue sandwich with tarragon or parsley sauce is a classic British dish that is both flavorful and satisfying. The tender and succulent tongue is thinly sliced and served between two slices of fresh bread. The tarragon or parsley sauce adds a tangy and herbaceous flavor that complements the richness of the tongue. This sandwich is perfect for a quick and delicious lunch or as a light dinner option. It is also a great way to use leftover tongue from a previous meal.