Mobile cheesemaker Steffi Heidrich stops off at farms throughout north Germany’s pastures to make milk into cheese with her converted truck. This morning, her vehicle, whose official name is Heidi’s mobile cheese dairy, has halted at a farm in Rotenburg, in Lower Saxony. Barely has she parked and before long, some 1,000 litres of milk is flowing through her hoses into a large stainless steel tank located inside the truck. Heidrich, wearing a hairnet, apron and clean rubber boots, monitors the equipment as it hums and hisses, presses buttons and takes the temperature of the milk inside the chee…