This is the Brexit Biscuit, a shortbread snack of two halves. It may be eaten whole, or one half at a time, or simply broken apart in a symbolic way: one side kept forever, the other discarded. It comes in a pack of twelve, wrapped in a free but tear-up-able copy of Article 50, and packed in a beautiful old-fashioned tin box, good for keeping things in. Obtainable here.