Spread one side of the slices of bread with the butter. Turn four of the slices over (buttered side down), spread with Nutella and add half a slab of the whole nut chocolate to the centre of each.

Top each slice with a slice of bread (buttered side up). Sandwich together. Pop into the jaffle iron, one sandwich at a time, close the jaffle iron and cook over hot coals, or on a preheated plate on the stove top, until golden brown.