Line a baking tray (sheet) with silicone (baking) paper. Spoon the basic ganache into a piping (pastry) bag fitted with a plain 15mm (¾ inch) nozzle (tip) and pipe finger-width rows onto the prepared tray (sheet). Leave to set, uncovered, overnight in a cool, dry area.
Use a warm, dry knife to cut the rows of ganache into 3.5cm (1½ inch) long oblongs.